Question

A two digit number is written on a paper slip and these are all put in a box. What is the probability that the product of the digits of a number drawn is a prime number ?

• A. 1/10
• B. 2/45
• C. 4/45
• D. 1/25

Answer 1

Answer:

C. 4/45

Total 2 digit numbers = 90 prime numbers - 2, 3 , 5 , 7 12, 13 , 15 , 17, 21 , 31, 51, 71 probability = 8/90 = 4 / 45