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A student is asked to answer seven of ten questions on a test. How many different...

A student is asked to answer seven of ten questions on a test. How many different ways can a selection of questions occur if:

a) there are no restrictions?

b) if there are five questions that must be answered? (5 questions must be done so you have to do 2 of the last 5)

Math   Statistics-And-Probability   
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