How many 3 letter words can be formed from the word how using the generating function?
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You can also split it into specific cases, which would probably be easier. Consider the 3-perms of MII, MSS, MPP, MIS, MIP, SSS, III, PPS, PSS, etc. (Not sure if I got them all.) Then you can use the formula
n!n1!n2!⋯nk!
where ∑k≤nnk=n, for each specific case
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