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
∴ P(A) = \(\frac{n(A)}{n(S)}\) = 6/20
∴ P(A) = 3/10
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
∴ P(B) = \(\frac{n(B)}{n(S)}\) = 6/20
∴ P(B) = 3/10
iii. Let C be the event that the number so formed is a multiple of 11.
∴ C = {11,22,33,44}
∴ n(C) = 4
∴ P(C) = \(\frac{n(C)}{n(S)}\) = 4/20
∴ P(C) = 1/5
∴ P(A) = 3/10, P(B) = 3/10, P(C) = 1/5