JEE Main2012MathematicsPermutation and CombinationActual
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
Options
- A880
- B629
- C630
- D879
Correct answer
D. 879
Step-by-step solution
Number of ways of selecting one or more balls from 10 white, 9 green, and 7 black balls =(10+1)(9+1)(7+1)-1=11 10 8-1=879.