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Question

The number of positive integer satisfying the inequality n+1Cnn+1Cn1100 is

A
9
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B
8
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C
5
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D
None of these
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Solution

The correct option is B 8
n+1Cnn+1Cn1100
n+1C3n+1C2100
(n+1)n(n1)6(n+1)n2100
(n+1)n(n1)3n(n+1)600
(n+1)n(n4)600
The values of n satisfying this inequality are
2,3,4,5,6,7,8,9.

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