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In how many ways can 4 mathematics books, 3 physics books, and 2 chemistry books be...

In how many ways can 4 mathematics books, 3 physics books, and 2 chemistry books be arranged on a bookshelf if
a) the books can be arranged in any order ?
b) the mathematics books must be together, the physics books must be together, and
the chemistry books must be together ?
c) the mathematics books must be together, but the other books can be arranged in
any order ?
Math   Statistics-And-Probability   
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