posted by Kamil .
A bag contains 5 black 3 white and 2 red balls.state in the how many can (a) 3 balls be drawn at random (b) 3 black balls be drawn (c) 2black and 2 white balls be drawn?
It would help if you proofread your questions before you posted them. Don't know about a.
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
(b) 5/10 *(5-1)/(10-1) * 3/8 = ?
(c) 5/10 * 4/9 * 3/8 * 2/7 = ?