Question

(iv) If five times the 5th term of an A.P. is equal to eight times its 8th term, then
show that its 13th term is zero.
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Answer 1

Answer:

The answer is given in attachment.

Step-by-step explanation:

Hope it helps u.....

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Answer 2

Answer:

Step-by-step explanation:

Let of the AP

first term= a

common difference=d

ATQ

5[a+(5-1)d]=8[a+(8-1)d]

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

5a + 20d = 8a + 56d

3a = 36d

a= -12d

Now 13th term

a+(13-1)d

=-12d+12d

=0