1.

A library has a copies of one book, b copies of each oftwo books, c copies of each of three books, and singlecopies of d books. The total number of ways in whichthese books can be distributed is(a + b + c + d)!(a + 2b +30 +d)!a! b! c!a! (b!)? (c!)(a +2b + 3c+d)!(d) none of thesea! b! !​

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ANSWER:

a+2b + 3C +d is UR answer.

hope this will HELP U



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