Stats help

Four fair dice are rolled. Find the probability that (a) the number 6 appears at least twice and (b) the number 6 appears exactly once.

I got (a) .131 and (b) .386

Are these correct?
Please show your work!

Yes, the numbers are correct, but I would like to see how you handled the binomial formula, especially if you used the proper shortcut for "at least twice."

 
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