Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2011 Question 15

Math Olympiad Vault · MathNet 2011

Question 15

Tio Mané has two boxes, one containing seven distinct balls numbered $1$ to $7$, and the other containing eight distinct balls labelled with all primes less than $20$. He draws one ball from each box at random.

Hint: Calculate the probability that the product is odd. What is the probability that the product of the numbers on the drawn balls is even?