61-74 ■ Combinations These exercises involve counting combinations.
Choosing Clothing If a woman has eight skirts, in how many ways can she choose five of these to take on a weekend trip?
The number of ways the woman can choose skirts out of .
The order of choosing skirts from a total of is not considered.
The formula of the number of combinations is as follows.
Here, is the total number of objects and is the number of objects chosen.
Substitute for and for as follows.
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