Which term of the AP 25, 20, 15,…. Is th...

Which term of the AP 25, 20, 15,…. Is the first negative term?

A

10th

B

9th

C

8th

D

7th

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The correct Answer is:

D

Let `T_(n) lt 0. "Then," 25 + (n-1) xx (-5) lt 0`
`therefore 30 lt 5n rArr 5n gt 30 rArr n gt 6`
So, the required term is 7th.

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