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djyliett [7]
3 years ago
9

Type the formula for the number of combinations of n things taken r at a time. C(n, r) =

Mathematics
2 answers:
PIT_PIT [208]3 years ago
8 0

Answer: C(n,r)=\frac{n!}{(n-r)!r!} where n represents the total number of objects, and r represents the number of objects being selected at a time.

Step-by-step explanation:

  • Combination is a collection of the items where the order doesn't matter. It is a way to calculate the total outcomes of an event where order of the outcomes does not matter.

The formula for the number of combinations of n things taken r at a time is

C(n,r)=\frac{n!}{(n-r)!r!}

SOVA2 [1]3 years ago
4 0
Formula: <span><span>
</span> <span>   <span>Note: , where nPr is the formula for permutations of n objects taken r at a time.</span> </span> <span> Example: <span>How many different committees of 4 students can be chosen from a group of 15? </span> </span> <span> Answer: <span>There are possible combinations of 4 students from a set of 15.</span> </span> <span>   <span> There are 1365 different committees.</span></span></span>
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\huge\boxed{n = -2}

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