An electronics store receives a shipment of 40 graphing calculators, 7 that are defective. Four of the calculators are selected to be sent to a local high school. How many of these selections will contain no defective calculators?
Added by Elizabeth B.
Step 1
This is a combination problem, because the order in which we select the calculators doesn't matter. The formula for combinations is C(n, k) = n! / [k!(n-k)!], where n is the total number of items, k is the number of items to choose, and "!" denotes factorial, Show more…
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