A box contains 7 red , 6 white and 4 blue balls. Number of ways of selection of three red balls is

A box contains 3 red, 4 white and 2 black balls. The number of ways in which 3 balls can be drawn from the box, so that at least one ball is red , is ( all balls are different )

A box contains 3 red, 4 white and 2 black balls. The number of ways in which 3 balls can be drawn from the box, so that at least one ball is red , is ( all balls are different )

Three balls are to be chosen from a box contaning 3 red ,2 white and 4 blue balls.Find the probability that all the three balls are of different colour.

There are three piles of identical red, blue and green balls and each pile contains at least 10 balls. The number of ways of selecting 10 balls if twice as many red balls as green balls are to be selected, is