A blood bank needs 9 people to help with a blood drive. 14 people have volunteered. Find how many different groups of 9 can be formed from the 14 volunteers.
Question
Solution 1
This is a combination problem. In mathematics, a combination is a selection of items without regard to the order. In this case, we are selecting 9 people out of 14, and we don't care about the order in which they are selected.
The formula for combinations is:
C(n, k) = n! / [k!(n-k)!]
where:
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