Sample space
(S) = {10, 11, 12, 13, 14,
20, 21, 22, 23, 24,
30, 31, 32, 33, 34,
40, 41, 42, 43, 44}
∴ n(S) = 20
i. Let A be the event that the number so formed is a prime number.
∴ A = {11, 13, 23, 31, 41, 43}
∴ n(A) = 6
ii. Let B be the event that the number so formed is a multiple of 4.
∴ B = {12, 20, 24, 32, 40, 44}
∴ n(B) = 6
iii. Let C be the event that the number so formed is a multiple of 11.
∴ C = {11, 22, 33, 44}
∴ n(C) = 4
