Question

Find the nth term of AP 15,12,9,........

Answer 1

Answer:

a=15

common difference = 12-15 = -3

n term = a + (n -1)d

= 15 + (n -1)*(-3)

= 15 + (-3n) + 3

= 18 -3n

Answer 2

step by step

Here , a = 15 and d =12-15= -3

According to formula

n th term = a + (n-1) d

=15+ n×-3-(-3)

=15-3n+3

=18-3n