Mathematics
NULL
Medium
Question
One principal and two vice-principal posts are filled from six candidates; only two are eligible for principal (all for VP). How many selection combinations are there?
A
4
B
12
C
18
D
None of these
✓ Official correct answer
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A
4
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B
12
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C
18
No member explanations yet for this option.
D
None of these
No member explanations yet for this option.
Explanation
Choose principal in 2 ways, then 2 VPs from the remaining 5 in ⁵C₂ = 10 ways ⇒ 20 combinations, which is not listed ⇒ None of these.