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How many 11 -digit positive integers can be written using only the digits 1,2 and 3 and have exactly three 1’s and exactly two 2's as digits?

 Oct 8, 2022
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Combinations ==(1, 1, 1, 2, 2, 3, 3, 3, 3, 3, 3)==1 combination

 

Permutations ==11! / [6!*2!*3!] ==4,620 permutations.

 Oct 8, 2022

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