Question

which term is the first negative term in an ap 24,21,18...​

Answer 1

Answer:

10th term

Commmo difference ( d ) = 21-24 = -4. => n = 9. Hence, The 10th term is the first negative term of the given AP.

Answer 2

Answer:

The given A.P.: 24,21,18....

a= 24

d=-3

n=?

Let us first find which term will be 0.

Using the formula : an= a+(n-1)d

0-24-(n-1)(-3)

24-3n+3=0

n= 9

So 9th term will be O. Hence 10 term will be first negative. Again using the same formula where n= 10, we get,

An= 24+9(-3)=-3

Hence first negative term is -3.