math
posted by chris .
a bag contains 12 black checkers and 12 red checkers. What is the probability of choosing two red checkers?

Did this students have the complete question?
http://www.jiskha.com/display.cgi?id=1275904679
Yours in incomplete.
You don't say how many checkers are chosen. 
P(R1)=12/24 (first red)
P(R2)=11/23 (second red)
P(2*R)=(12/24)*(11/23)=11/46 (both red)