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Permutations & Combinations

Four persons ...

Question

Four persons P, Q, R and S are to be seated in a row. R should not be seated at the second position from the left end of the row. The number of distinct seating arrangements possible is:

A

24

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B

9

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C

6

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D

18

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Solution

The correct option is D 18
$Number of arrangements = 3 \times 3! = 18$

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