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Q.

The least positive integral value of x for which  10Cx1>2 10Cx is 

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a

5

b

8

c

9

d

6

answer is B.

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Detailed Solution

10Cx-1>2(10Cx) (10)!(11-x)! (x-1)!>2 10!(10-x)! x! (10-x)! x!>2(11-x)!(x-1)!    x>2(11-x)   3x>22  x8, 9, ... Least value of x=8.

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