Math, asked by Arshrastogi8315, 11 months ago

7th term of ap is 40. The sum of its first 13th term is

Answers

Answered by harysidhu

11

a+6d=40
a=40-6d
now sum
sn=1/2×2×40-6d+(n-1)×d

Answered by abi916rani

0

Answer:

520 is your answer!!!

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