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The number of ways in which 5 Mathematics, 4 Physics, 2 Chemis
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The number of ways in which Mathematics, Physics, Chemistry books can be arranged in a shelf if the books on the same subject are kept together.

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The number of ways in which Mathematics, Physics, Chemistry books can be arranged in a shelf if the books on the same subject are kept together.
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Books on each subject can be arranged amongst themselves in the following ways:
Mathematics- books in waysways
Physics- books in waysways
Chemistry- books in waysways
Since, the arrangement of these three groups of subjects can be made in ways.
By the multiplication principle, the required number of permutations are 
ways

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Question Text
The number of ways in which Mathematics, Physics, Chemistry books can be arranged in a shelf if the books on the same subject are kept together.
Answer TypeText solution:1
Upvotes150