Question

Find the number of three digit natural numbers which are divisible by 11.

Answer 1

121 is divisible by 11

Answer 2

110, 121, 132, ......... 999

a = 110

d = 11

L = 990

=> a +(n-1)d = 990

=> 110 + (n-1)* 11 = 990

=> 11*(n-1) = 990 - 110

=> 11(n-1) = 880

=> n-1 = 80

=> n = 81


Required Answer = 81