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Assuming the balls to be identical except for difference of colours the number of ways in which one or more ball can be selected from 10 white, 9 green and 7 black balls is:

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detailed solution

Correct option is C

We can select 0 or more balls out of 10 white balls in 11 ways. [select 0 or 1 or 2 or 10 white balls.]Thus, the number of ways of making a selection of 0 or more balls


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