Question

Find the 12th and nth term the Ap of the Ap 9,13,17,21,----------,53,101,4n+5

Answer 1

a=9
d= 4
hence 12 th term is
=a+11d
=9+11*4
=53

nth term
9+4(n-1)

Answer 2

a = 9

d = 13-9 = 4

d=4

a12

a + 11d

9 + 11(4)

9 + 44

53

nth term

9 + (n-1) 4