a) 30C4=27405
b) 6C2x24C2=4140
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?
2 answers
30 C 4
3 answers