There are 4 copies (alike) each of 3 different books. Find the number of ways of arran
12 books in a shelf in a single row.
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Answer:
Total number of books =3×4=12
in which each of 4 different books is repeated 3 times.
Hence required number of arrangements
= 12! / 3!×3!×3!×3!
=12! / (3!) ^4
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