Skip to main content
OlympiadHQ

Browse · MATH

Print

jmc

counting and probability senior

Problem

We roll a fair 6-sided die 5 times. What is the probability that we get an odd number in exactly 4 of the 5 rolls?
Solution
The chances of getting an odd or even number are equal, so there are equally likely outcomes. If we want to get exactly 4 of 5 the rolls to be odd, the probability is
Final answer
\dfrac{5}{32}