Question

which term of AP:21,18,15....is-75?

Answer 1

Given that ,

Tn = -75

21 + ( n - 1) × -3 = -75

n - 1 = -75-21/-3

n - 1 = 32

n = 33 Ans.

Answer 2

Answer:

37th

Step-by-step explanation:

we can see the series

a=21     d= -3

we know nth term= a+(n-1)*d

                                  -75=21+(n-1)*(-3)

                                -75-21=(n-1)*(-3)

                                      96=(n-1)*3

                                     36=n-1

                                       n=37

so 37th term will be -75