Question

24th teram of A.P. 9, 13, 17, 21 .....

Answer 1

a=9
d=13-9=4
n=24
then,a24=a+(n-1)d
              =9+(24-1)4
              =9+23*4
              =9+92
              =101

Answer 2

a = 9 d = 13-4 = 4 n=24
T24 = a + (n-1)d
T24= 9 + (24-1)4
T24 = 9 + 23x4
T24= 9 + 92
T24 = 101