1.

If a denotes the number of permutations of x+2 things taken all at a time, b the number of permutations of x things taken 11 at a time and c the number of permutations of x -11 things taken all at a time such that a=182bc, then the value of x will be

Answer»

A. 12
B. -12
C. 6
D. none of these

Answer :C


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