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If a denotes the number of permutations ...

If a denotes the number of permutations of x + 2 things taken all at a time, b denotes the number of permutations of x things taken 1 1 at a time and c denotes the number of permutations of x - 1 1 things taken all at a time such that a = 182 be, then the value of x is

A

15

B

12

C

10

D

18

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