UrbanPro

Location Set your Location

Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Take Class 12 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

Class 12 Tuition > Learn Class XI-XII Tuition (PUC) > 7th term of an A.P. is 40. then find the sum of first...
✕

Search in

7th term of an A.P. is 40. then find the sum of first 13 terms ?

Asked by Last Modified  

16 Answers

Learn Class XI-XII Tuition (PUC) +1 Mathematics

Follow 8
Answer

Please enter your answer

CSAT Tutor, BPSC DI Tutor (Ex. Drishti IAS Senior Content Writer)

7th term =40=a + 6d sum of 13 term =(13/2)(2a+12d)=13(a+6d)=13*40=520
Comments
Dislike Bookmark

Tutor

a+6d= 40 S13= 13/2(2a+12d) = 13(a+6d) = 13*40 = 520 let series a,a+d,a+2d,............a+nd 7th term=a+6*d=7 sum of 13 terms=13/2*(a+a+12*d)=13*(a+6*d)=520
Comments
Dislike Bookmark

Maths lover

let series a,a+d,a+2d,............a+nd 7th term=a+6*d=7 sum of 13 terms=13/2*(a+a+12*d)=13*(a+6*d)=520
Comments
Dislike Bookmark

Home Tutor

520
Comments
Dislike Bookmark

Math magacian

a+6d= 40 ....(1) S13 = 13/2 = 13/2*2 ........(2) = 13 *40. From eq (1) ' = 520
Comments
Dislike Bookmark

given 7th term = 40 i.e. a + 6d = 40 sum to 13 term = (13/2) (2a + 12 d) = (13/2) 2(a+6d) = (13) (40) =520
Comments
Dislike Bookmark
Sum of 13 terms =middle term×no. of terms=7th term×13=40×13=520
Comments
Dislike Bookmark

Problem Cracker

tn=a+(n-1)*d where tn is the nth term, here it is 40, a is the first term, n is the term no, here n=7 and d is the common interval. so, a+(7-1)*d=40 a+6d=40----------------------------(i) now the sum of nth term is Sn= (n/2)*{2a+(n-1)*d} = (13/2)*{2a+(13-1)*d} =6.5*(2a+12d) ...
read more
tn=a+(n-1)*d where tn is the nth term, here it is 40, a is the first term, n is the term no, here n=7 and d is the common interval. so, a+(7-1)*d=40 a+6d=40----------------------------(i) now the sum of nth term is Sn= (n/2)*{2a+(n-1)*d} = (13/2)*{2a+(13-1)*d} =6.5*(2a+12d) =6.5*2(a+6d)--------------------------(ii) now putting the value of equation (i) in equation (ii) we get, Sn= 6.5*2*40 =520 read less
Comments
Dislike Bookmark

Tutor with 15 years of teaching experience

a+6d= 40 S13= 13/2(2a+12d) = 13(a+6d) = 13*40 = 520
Comments
Dislike Bookmark

For the given A,P. a+6d=40, Then sum of 13 terms of this A.P. is 13/2( 2a+12d) =13(a+6d) = 13(40) = 520.
Comments
Dislike Bookmark

View 14 more Answers

Related Questions

A point pole has a strength of 4? × 10-4 weber. The force in newtons on a point pole of 4? × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be a.) 20 N. b.) 15 N. c.) 7.5 N. d.) 3.75 N.
Kindly re-post the question without question mark symbol.
Kumar Upendra Akshay
0 0
6
The number of ways that a mixed doubles tennis game can be arranged from 7 married couples if no husband and wife play on the same game.
Probably explaining it is better......You have to pick 2 people of same gender and 2 of other gender so that you have 4 people for mixed doubles. To avoid same wife-husband combo, pick 4 pairs among 7...
Ravi
lim(x ?0)? (1+sin?x )^cot? x = ?
Dear Akshay, the question is not clear as there is some typing error. Please post the question again.
Kumar Upendra Akshay
Imagine a protein that functions in the ER but requires modification in the Golgi apparatus before it can achieve that function. Describe the protein’s path through the cell, starting with the mRNA molecule that specifies the protein.
The protein is synthesized into the lumen of the ER and perhaps modified there. A transport vesicle carries the protein to the Golgi apparatus. After further modification in the Golgi, another transport vesicle carries it back to the ER.
Mano
2 0
6
This is a question for students of commerce stream. Human resource is not shown as an asset in the balance sheet; though managers claim that it is the most important asset of an enterprise, especially the service oriented enterprise. What could be the reasons for not recognizing human resource as an asset on the balance sheet?
This is due to the following reasons : 1. The basis for determining the Value of this Asset. 2. Absence of any existing accounting standards for the same, 3. The possible tax implications.
Manik

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Necessity of Theory and Practical in Computer Science.
Upon studying a subject both theory and practical are important. Usually many schools concentrate more on theory and the marks not on the practical. Other and opposite kind of people prefer practical...

Ganesa M.

0 0
0
Electrostatic
Electrostatic is study about the charge. In electrostatic we study about when charge at rest. Charge: Charge is important point for study about electrostatic.charge is a scaler quintity. And the unit...

Lokesh Kumar Parmuwal

0 0
0
Introduction To Accounting: Part 13: Money Measurement Concept
According to the Money Measurement Concept, only those transactions and events are recorded in the books of accounts which can be measured in terms of money. Therefore, a transaction which cannot...

Nishant Kumar

0 0
0
Polymerase Chain Reaction
The polymerase chain reaction (PCR) was originally developed in 1983 by the American biochemist Kary Mullis. PCR is used in molecular biology to make many copies of (amplify) small sections of DNA. Using...

Nikita M.

1 0
0
Partnership firm - Merits and Demerits
What are merits and demerits of a partnership firm? (2 videos)

Rajiv Vadera

0 0
0

Recommended Articles

Meet Swati, a Hindi Tutor from Bangalore

Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...

Read full article >

Meet Sandhya R, a B.Sc tutor from Bangalore

Sandhya is a proactive educationalist. She conducts classes for CBSE, PUC, ICSE, I.B. and IGCSE. Having a 6-year experience in teaching, she connects with her students and provides tutoring as per their understanding. She mentors her students personally and strives them to achieve their goals with ease. Being an enthusiastic...

Read full article >

Meet Urmila, an MBBS tutor from Bangalore

Urmila is a passionate teacher with over 8 years of experience in teaching. She is currently pursuing her Ph. D. She provides classes for Class 11, Class 12, MBBS and Medical tuition.  Urmila began her career in teaching long before she became a teacher. She used to provide classes for foreign national students in her college...

Read full article >

Meet Radhe Shyam Burman, an MBA Tutor from...

Radhe Shyam is a highly skilled accounts and finance trainer with 8 years of experience in teaching. Accounting is challenging for many students and that’s where Radhe Shyam’s expertise comes into play. He helps his students not only in understanding the subject but also advises them on how to overcome the fear of accounts...

Read full article >

Find Class XII Tuition near you
Class XII Tuition in Delhi
Class XII Tuition in Bangalore
Class XII Tuition in Hyderabad
Class XII Tuition in Kolkata
Class XII Tuition in Mumbai
Class XII Tuition in Chennai
Class XII Tuition in Pune
Class XII Tuition in Jaipur
Class XII Tuition in Lucknow
Class XII Tuition in Noida

Looking for Class 12 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for Class 12 Tuition Classes?

The best tutors for Class 12 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 12 Tuition with the Best Tutors

The best Tutors for Class 12 Tuition Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2024All Rights Reserved