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Permutation under Restriction

If the best a...

Question

If the best and the worst paper never appear together, then six examination papers can be arranged in how many ways

A

120

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B

480

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C

240

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D

None of these

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Solution

The correct option is B 480
If the best and the worst appear always together, the number of ways $5! \times 2$ . Therefore required number of ways $6! - 5! \times 2 = 480$

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