Question

Which term of A.P. , 121, 117, 113........is its 1st negative term?​

Answer 1

32th term is first negative term of this AP.

Let the nth term of ap be 0

2a+(n-1)d=0

then,

121+(n-1)(-4)=0

121-4n+4=0

125-4n=0

4n=125

n=31.25

n cannot be negative.

So 0 is not a term of this AP.

Henceforth the 32th term is first negative term of this AP.

Answer 2

Answer:

Refers to the attachment