Question

Explain: -27 is a term of the AP: 5, 2, -1,….

Answer 1

an=a+(n-1)d

-27=5+(n-1)-3

-27-5/3=(n-1)

-32/3=(n-1)

10.6666667=(n-1)

n=10.6666667+1

n=11.6666667

since it's not an whole number

not a term of the given a.p