No. of selections of one or more balls from 10 white, 9 black and 4 red balls, are:

Find the number of selections of 10 balls from unlimited number of red black and white balls.

Assuming the balls to be identical except for difference in colours , the number of ways in which one or more balls be selected from 10 white , 9 green and 7 black balls is :

Out of 10 white,9 black,and 7 red balls,find the number of ways in which selection of one or more balls can be made (balls of the same color are identical).

Assuming the balls to be identical except for difference in colours, the number of ways in which one or more balls can be selected from 10 white, 9 green and 7 black balls is

Assuming the balls to be identical except for difference in colours , the number of ways in which one or more balls can be selected from 10 white , 9 green and 7 black balls is -

Assuming the balls to be identical except for difference in colours, the number of ways in which one or more balls can be selected from 10 white, 9 green and 7 black balls is

A box B_(1) contains 1 white ball, 3 red balls, and 2 black balls. An- other box B_(2) contains 2 white balls, 3 red balls and 4 black balls. A third box B_(3) contains 3 white balls, 4 red balls, and 5 black balls. If 2 balls are drawn (without replecement) from a randomly selected box and one of the balls is white and the other ball is red the probability that these 2 balls are drawn from box B_(2) is