Math, asked by manasakavala5216, 1 year ago

If 5 times the 5th term of an A.P is equal to 8times its 8th term, show that it's 13th term is 0

Answers

Answered by rahman786khalilu

1

Answer:

5(a5)=8(a8)

5(a+4d)=8(a+7d)

5a+20d=8a+56d

20d-56d=8a-5a

-36d=3a

3a+36d=0

3(a+12d)=0

a+12d=0

a13=0

hence proved

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