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Question

From 10 persons waiting in a queue, in how many ways can a selection of 6 be made so that a specified person is always excluded?

A
126
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B
84
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C
94
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D
125
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Solution

The correct option is B 84
Total number of person =10
Number of person to be selected=6
Hence a specified person is always excluded
=1×9C6=84
Hence the correct answer is 84

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