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An electronic store receives a shipment of 30 graphing calculators, including 6 that are defective

An electronic store receives a shipment of 30 graphing calculators, including 6 that are defective. Four of these calculators are selected to be sent to a local high school. How many selections can be made? How many of this selections will contain two defective calculators?
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Answer #1
a) 30C4=27405

b) 6C2x24C2=4140
answered by: Dylan Hughes
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