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OpenStudy (anonymous):
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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OpenStudy (anonymous):
They are asking how many ways in which "one" or more can be selected so you can pretty much get one a different way for each ball. so 10+9+7
OpenStudy (anonymous):
Start with the zero or more case. You could pick 0-10 white balls, 0-9 green balls, and 0-7 black balls. That's 11 * 10 * 8 = 880 ways to select 0 or more balls. One of those ways is selecting zero balls, so there are 879 ways to select 1 or more balls.
OpenStudy (anonymous):
Welcome to OpenStudy @kiransai ! Here's a link to help you around OpenStudy! http://openstudy.com/study#/updates/52f5a913e4b0512c88e5ef0f
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