2006
Mathematics
67ca00ce0c643c71d77dee1f
A final examination requires that a student answer any 4 out of 6 questions. In how many ways can this be done?
A.
15
B.
20
C.
30
D.
45
Correct Answer: 15
Explanation
5C4 =6!/((6-4)!4!)=6!/2!4!=(6×5×4!)/(2×1×4!)=15ways
5C4 =6!/((6-4)!4!)=6!/2!4!=(6×5×4!)/(2×1×4!)=15ways
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