Question

which term of AP 39,27,15,.......is first negative term

Answer 1

Since n = 5
therefore first negative term will be:
39+(5-1) *(-12)
= 39-48
=-9
This is your solution
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Answer 2

There is deff. of 12 so next term is 3 and then first -ve term would be 3-12=-9

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