Let E be the set of all integers with 1 at their unit places. The probability that a number chosen from {2,3,4,......50} is an element of E, is

A) 5 / 49

B) 4 / 49

C) 3 / 49

D) 2 / 49

Correct answer:
B) 4 / 49

Description for Correct answer:
n(S) = 49
Favourable numbers are 11, 21,31, 41
Required probability = 4 / 49


Please provide the error details in above question