math
posted by jon apples on .
if there are 16 marbles in a bag and 8 are red red with 6 green and 2 blue what is the probability of getting matching marbles in 2 draws from the bag

could be RR GG or BB , assuming the 1st marble is not returned
prob(RR) = (8/16)(7/15) = 7/30
prob(GG) = (6/16)(5/15) = 1/8
.....
add them up.
I am sure you can handle the rest