## which term of an AP:7.3,6.9,6.5,6.1… is the first negative term

Question

which term of an AP:7.3,6.9,6.5,6.1… is the first negative term

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Mathematics
10 months
2021-07-07T15:04:32+00:00
2021-07-07T15:04:32+00:00 1 Answers
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## Answers ( )

A.P : 7.3,6.9,6.5,6.1…

a=7.3,d=6.9-7.3=-0.4

First negative term =an

We know 0.4*18=7.2

an =a+(n-1)d

Taking n-1 =18

an =0.1

Now if we take n-1=19

an = 7.3-7.6=-0.3

Therefore n-1=19 term is first negative. That means n=19+1=20

Hence 20th term is first negative term