Question: Let S1 = {A,E,I,O) and S2 = (B,C,D,F,G) which length is 20. Please solve following questions: 1) how many words are the each of

Let S1 = {A,E,I,O) and S2 = (B,C,D,F,G) which length is 20.

Let S1 = {A,E,I,O) and S2 = (B,C,D,F,G) which length is 20. Please solve following questions: 1) how many words are the each of letters in S1 appears 3 times and exactly 2 letters in S2 appear 4 times each? 2) how many words are exactly 2 letters in S1 appear 4 times each, 1 letter in S2 appears 5 times, another letter in S2 letter in S2 appears 4 times and a third letter in S2 appears 3 times?

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