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?
+128460 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%
+118608 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:
https://web2.0calc.com/questions/ben-rolls-four-fair-20-sided-dice-and-each-of-the
