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In this problem, we are constructing 12-letter words with four X's four Y's and four Z's

(a) How many such words have no X's in the first 4 letters

(b) How many such words have no X's in the first 4 letters and no Y's in the next four letters?

 Oct 14, 2020
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(a) There are 4378 words.

 

(b) There are 1356 words.

 Nov 29, 2020

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