Question

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

Answer 1

I think the answer is -18.............

Answer 2

d=-3

an=24+(n-1)-3

-3=24-3n+3

-30=-3n

3n=30

n=10

3 is multiple of a.p hence its first negarive term is -3 whuch is as 10 th term