Question
Question: Three integers are chosen at random from the first 20 natural numbers. The probability that their pr...
Three integers are chosen at random from the first 20 natural numbers. The probability that their product is even, is-
A
2/19
B
3/29
C
17/19
D
4/29
Answer
17/19
Explanation
Solution
Total number of ways = 20C3, Product even when atleast one is even= 1 – none is even
= 1 – 10C3/20C3