Probability word problem with marbles

Question

A bag contains 28 marbles total, with 9 red marbles, 9 white marbles, and 10 blue marbles.

You draw 3 marbles out at random, without replacement. What is the probability that all 3 are red?

P(all 3 are red)=

what is the probability that 2 of the marbles are red and 1 are not? P(2are red, 1 are not)=

What is the probability that none of the 3 marbles are red? P(none are red)=

Answer 1

9/28 x 8/27 x 7/26 = 504/19656=.0256 = 2.56% chance of all 3 red

probability of all not red =

19/28 x 18/27 x 17/26 = 5814/19656 = .2958 = 29.58% chance none are red