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A standard six-sided die is rolled $6$ times. You are told that among the rolls, there was one $1,$ two $2$'s, and three $3$'s. How many possible sequences of rolls could there have been? (For example, $3,2,3,1,3,2$ is one possible sequence.)

 Jun 30, 2021
 #1
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I found 120, but it is not correct, please HELP.

 Jun 30, 2021
 #2
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The number of ways is 6!/36 = 20.

 Jun 30, 2021

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