Ben rolls four fair 20-sided dice, and each of the dice has faces numbered from 1 to 20. What is the probability that exactly two of the dice show an even number?

Guest Dec 9, 2017

Each die will have the same probabililty of showing an even or odd number


So....the probability is


C(20,2)  (1/2)^20  =   95 / 524288 ≈ .0181%



cool cool cool

CPhill  Dec 9, 2017

Sorry Chris but you read the question incorrectly :(


You have found the probability of rolling exactly 2 heads in 20 rolls of the dice but there are only 4 rolls.


Continued here:


Melody  Dec 11, 2017

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