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Assuming the balls to be identical except for difference in colours,

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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 

(a) 630 

(b) 879 

(c) 880 

(d) 629

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(b) : Number of ways in which one or more balls can be selected from 10 white, 9 green, 7 black balls is
= (10 + 1) (9 + 1) (7 + 1) – 1
= 880 – 1 = 879 ways

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