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CFA Level 1 Question of the Week - Quantitative Methods
A teacher wants to select groups of 3 students out of 15 for a group work. How many different groups of 3 are possible?
CFA Level 1 Question of the Week - Quantitative Methods 7 votes
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Counting problems involve determining the exact number of ways two or more operations or events can be performed together. This particular counting problem can be solved using a combination, which is basically a selection of some given items where the order does not matter. The formula is:
nCr = n!/((n-r)!r!)
Where
n=15; and
r=3
nCr = 15!/((15-3)!*3!) = 455