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Natalia Knox tosses a fair die six times. What is the probability that she will toss exactly two 5's?

 Feb 17, 2020
 #1
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D=6; C=2; ((D nCr C * 5^(D-C)) / 6^D =20.09 %

 Feb 17, 2020
 #2
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So you have a 1/6 chance of getting a 5 on the first dice.

 

The second dice you ALSO have a 1/6 chance of getting a 5.

 

1/6 * 1/6 = 1/36.

 

Probability = 1/36.

 Feb 17, 2020

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