Question

Which term of an AP: 150,147,144_____ is it's first negative term?

Answer 1

a=150
d=147-150=-3
first negative term will come after 0.
so,we will find 0th term first.
an=0
an=a+(n-1)d


0=150+(n-1)(-3)
0=150-3n+3
0=153-3n
3n=153
n=153/3


n=51

there fore 51 term will be 0

and

next term will be negative,
that is 52.

therefore first negative term will be 52.........
answer..

Answer 2

the answer is there in the attachment .

hope it helps you