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Question

If the 3rd and the 9th terms of an AP are 4 and8 respectively, which term of this is zero?

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Solution

a3a+2d=4...(1)
a4a+8d=8...(2)
Subtracting (2) from (1), we get
a+2d=4
a+8d=8
_________________
6d=12
d=2
a=42d=4+(2)(2)a=8
A.P8,6,4,2,0,2,...
As we can see, a5=0
5th term in this A.P is 0.

1135646_1144497_ans_6fc211e6f14b41e2af4390e906544760.jpg

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