I have some 4 sided dice. I roll 5 of the dice. What is the probability that I roll exactly 2 '1's & exactly 2 '2's?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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I have some 4 sided dice. I roll 5 of the dice.

What is the probability that I roll exactly 2 '1's & exactly 2 '2's?

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