Question: I have 10 different books: five are for statistics, three are for econometrics and two are for German. (a) How many ways can I arrange

I have 10 different books: five are for statistics, three are for econometrics and two are for German.

(a) How many ways can I arrange them on my shelf?

(b) Same question, but what if I want to keep books of the same subject together?

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