Question

What is the probability that a randomly chosen two-digit positive integer is a multiple of 3. Select the correct answer from above options

Answer 1

Let n(s) = 90 A = {12,15 ……………… 99} n(A) = 30 P(A) = n(A) n(S) = 30 90 = 1 3 Using a + (n — 1)d = Tn 12+ (n – 1)3 = 99 12 + 3x – 3 = 99 3x = 99 – 9 3x = 90; x = 30