Question

if 8 times the 8 term of an AP is equal to 7 times its 7 term, then what is it 15th term?

Answer 1

8×A8=7×A7
8 (a+7d)=7 (a+6d)
8a+56d=7a+42d
a=-14d
A15=a+14d
=-14d+14d
=0




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Answer 2

is it clear? First I wrote down given info and then I found the value of a through the equation. I substituted the value in t15 and found the answer.