a 3 - digit positive integer is chosen at random . what is the probability that the product of its digits is even ?	Choose the correct choice from the following choices: A) 1 / 2 B) 31 / 36 C) 49 / 54 D) 7 / 8 E) 11 / 12

Rationale: p ( three odd digits ) = 5 / 9 * 5 / 10 * 5 / 10 = 5 / 36 ( first digit can not be 0 , so we have a total of 9 digits , 4 even and 5 odd ) . therefore , p ( at least one even digit ) = 1 - 5 / 36 = 31 / 36 . answer b .
Answer: B