1-24 Counting These exercises involve counting.
Test Questions If you must answer only eight of ten questions on a test, how many ways do you have of choosing the questions you will omit?
The number of ways of choosing a question that will be omitted.
A combination of objects from a set is any subset of the set that contains elements (without regard to order).
If a set has objects, then the number of combination of elements from the set is denoted and is called the number of combination of objects taken at a time.
Substitute for and for in equation
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