Homework Help: Math

Posted by Oshurbekova on Monday, February 20, 2012 at 9:45am.

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?

Math - YOY, Monday, February 20, 2012 at 10:13am
a) 30C4=27405

b) 6C2x24C2=4140
Math - Anonymous, Saturday, May 11, 2013 at 8:14pm
30 C 4

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