An electronics store receives a shipment of 30 graphing calculators, including 5 that are defective. Four of the calculators are selected to be sent to a local high school.A) How many selections can be made using the original shipment?B) How many of these selections will contain no defective calculators?
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(A) C(30,4) = 30! / (4!26!) = 27,405
(B) C(25,4) = 25! / (4!21!) = 12,650