Thuy rolls a number cube 7 times. which expression represents the probability of rolling a 4 exactly 2 times?

Hence, the probability of rolling a 4 exactly 2 times is:

Step-by-step explanation:

It is given that:

Thuy rolls a number cube 7 times.

so the total outcomes are: 6.

Also it is asked to find the probability of rolling a 4 exactly 2 times.

So it could be done by the method that:

( where denotes the probability of rolling a 4 and denotes the probability of rolling a number other than 4 ).

Hence, the probability of rolling a 4 exactly 2 times is:

69

step-by-step explanation:

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