A final examination requires that a student answer any 4 ...
A final examination requires that a student answer any 4 out of 6 questions. In how many ways can this be done?
15
20
30
45
Correct answer is A
The question will be answered in
5C4=6!(6−4)!4!=6!2!4!=6×5×4!2×1×4!=15ways
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