Math, asked by jasleen12345, 1 year ago

HELLO..
Please help me find the answer

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Answers

Answered by sangeetapal18892

4

Answer:

the sum of 3rd and 7 th term is

a+2d+a+6d=6. =2a+8d= 6 a+4d=3 ( eq i )

(a+2d) (a+6d)=8

n=20

Step-by-step explanation:

we know that

sn= n/2(2a+(n-1)d)

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