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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

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630

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answer is B.

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Detailed Solution

No of white balls = 10

No of green balls = 9

No of black balls = 7

No of ways of Selecting one or more balls.

= (10+1) (9+1) (7+1)-1

= 11 (10) (8) -1 = 879

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