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A three-digit positive integer is chosen at random. What is the probability that the product of its digits is even?

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by BTGmoderatorDC » Sun Jun 20, 2021 4:54 pm

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A three-digit positive integer is chosen at random. What is the probability that the product of its digits is even?

A. 1/2
B. 31/36
C. 49/54
D. 7/8
E. 11/12


OA B

Source: Manhattan Prep
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Re: A three-digit positive integer is chosen at random. What is the probability that the product of its digits is even?

by swerve » Tue Jun 22, 2021 3:00 pm
BTGmoderatorDC wrote: ↑
Sun Jun 20, 2021 4:54 pm
 A three-digit positive integer is chosen at random. What is the probability that the product of its digits is even?

A. 1/2
B. 31/36
C. 49/54
D. 7/8
E. 11/12


OA B

Source: Manhattan Prep
A quick way to solve it consists of computing the probability of the complementary event:

P(three odd digits) \(= \dfrac{5}{9}\cdot \dfrac{5}{10}\cdot \dfrac{5}{10} = \dfrac{5}{36} \)(first digit cannot be \(0,\) so we have a total of \(9\) digits, \(4\) even and \(5\) odd).

Therefore, P(at least one even digit) \(= 1 - \dfrac{5}{36} = \dfrac{31}{36}.\)

Hence, B
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