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If I roll a fair, regular six-sided die four times, what is the probability that I will roll the number 5 exactly two times?

 Oct 19, 2020
 #1
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 (4 nCr 2 * 5^2)  / 6^4 =150 / 1296 = 25 / 216 =11.57%

 Oct 19, 2020
 #2
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4C2  *  (1/6)^2  *  (5/6)^2

 Oct 20, 2020
edited by Melody  Oct 20, 2020

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