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 :
(1) 880 (2) 629 (3) 630 (4) 879

Question

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 :
(1) 880 (2) 629 (3) 630 (4) 879

anonymous · Answer

(10+1)*(9+1)*(7+1)-1=
11*10*8-1=
880-1
=879