Question

Find the nth term of AP 3K, 5K, 7k,---​

Answer 1

a = 3k
d = 2k
an = a+(n-1)d
= 3k+(n-1)(2k)
= 3k+2nk - 2k
= k+2nk
an= k(2n+1)

Thus the nth term of the AP is k(2n+1)