math
posted by cathy .
an electronics store receives a shipment of 40 graphing calculators including 3 that are defective. Four of the calculators are sleceted to be sent to a local high school. How many selections can be made using the original shipment

MathMate answered the same question last March, except there were 20 calculators instead of your 40
make the corresponding changes.
http://www.jiskha.com/display.cgi?id=1299561374