Combinations These exercises involve counting combinations.
Choosing Exam Questions A student must answer seven of the ten questions on an exam. In how many ways can she choose the seven questions?
The number of ways in which student can choose the seven questions.
The total number of questions in exam is .
The total number of questions to be chosen is .
The number of combination (or selection) of objects taken at a time is
Substitute for , for in equation
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