Assuming the balls to be identical expect for difference in colours, The number of ways in which one or more balls can be selected from 10white , 9 green and 7 black balls is-
A
879
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B
880
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C
629
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D
630
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Solution
The correct option is A879 Total no. of ways for selected one or more balls =(10+1)(9+1)(7+1)−1