Combination of n Different Things Taken One or More at a Time
Assuming the ...
Question
Assuming the balls to be identical except for difference in colors, the number of ways in which one or more balls can be selected from 10 white, 9 green and 7 black balls is
A
880
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B
629
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C
630
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D
879
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Solution
The correct option is D879 10W9G7B↓↓↓11108
Total ways = 11×10×8 = 880
No. of ways in which no one is selected = 1
No. of ways in which more than one ball can be selected = 880-1 = 879