Ajar contains four white marbles, five red marbles, and six black marbles. if three marbles were selected without replacement at random, find the probability that they are all red.

There would be one red marble

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet

explanation:

previous steps have made pa≅ pb ≅ st ≅ su. setting the compass width to ab allows you to make tu the same length. then δstu ≅ δpab by the sss congruence postulate, and ∠p ≅ ∠s by the reason cpctc.