Natalia Knox tosses a fair die six times. What is the probability that she will toss exactly two 5's?
D=6; C=2; ((D nCr C * 5^(D-C)) / 6^D =20.09 %
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.