Math, asked by Anonymous, 1 year ago

The sum of first seven terms of an AP is 63 and the sum of next 7 terms is 261.Find the20th term of this AP.

A.P

Please help!

I WILL MARK AS BRAINLIEST!

Answers

Answered by siddharth19402

(7/2)(2a+6d)=63

(14/2)(2a+13d)-63=261

a+3d=9

2a+13d=????? i think u have given wrong data plz Check and the process will be same

siddharth19402: the process is same u can proceed like that maybe my calculation is wrong

siddharth19402: see what i have done use the same method

siddharth19402: sum of next 7terms=sum of 14terms -sum of 7terns

Answered by sanjay6448

the numbers be

a-3d+a-2d+a-d +a +a+d+a+2d+a+3d=63

7a=63

a=9

Previous Question

Next Question

Similar questions

Physics, 7 months ago

English, 7 months ago

Social Sciences, 7 months ago

Social Sciences, 1 year ago

English, 1 year ago

Math, 1 year ago

Science, 1 year ago

India Languages, 1 year ago