Question

Which term of Ap 21,18,15,...is-81?

Answer 1

A.P = 21,18,15,....

a = 21 (First term)

d = 18-21 = -3

Need to find 'n'

an = -81

an = a+(n-1)d

-81 = 21+(n-1)(-3)

-81-21 = (n-1)(-3)

-102 = -3(n-1)

-102/-3 = n-1

34 = n-1

n = 34+1

n = 35

The 35th term of this A.P is -81

Answer 2

Answer:

Here is your answer mate..

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