Question

which term of the AP 19.18.17....
is the first negative term​

Answer 1

Answer:

Step-by-step explanation:

19,18,17

here a=19 d=-1

So -1 is the first negative,Let nth term is-1

then -1=19+(n-1)(-)

-20 = -n + 1

n=21

Thus 21 st term is the first negative term

Answer 2

Answer:

N = 21

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