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Problem Solving (PS) | Re: Each student at a certain university is given a four-charact

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Avinashs87 wrote:

Bunuel...Why are we not multiplying it by 4! to account for the different ordering that can be got.


To anyone wondering why, multiplying by 4! means getting different orders like Number.Number.Alphabet.Alphabet and Number.Alphabet.Number.Alphabet which is not required here.

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