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How many eight-digit positive integers can be written using only the digits 1 and 2 and have exactly five 1’s and four 2's as digits?

 Oct 10, 2022
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[1, 1, 1, 1, 1, 2, 2, 2] ==1 combination

 

8! / [5!*3!] ==56 permutations.

 Oct 10, 2022

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