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Question

If B3 can have only C1 or C5, in how many ways can you arrange the caps such that all boxes have one cap?

A
480
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B
420
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C
48
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D
88
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Solution

The correct option is C 48
B3 can be filled in 2! ways and rest can be filled in 4! ways.
Hence, required number of ways =2×4!=48.

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