Question

Which term of the a.p 121,117,113.....is the first negative term

Answer 1

let the nth term is first negative term = an
so an<0 (negative term is less than 0)
a= 121 d= -4
so,
a+(n-1)d < 0
121-4n+4<0
125-4n<0
125<4n
125/4 < n
31.25< n
the first negative term is greater than 31.25
so the first negative term is 32

Please mark it BRAINLIEST