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There are 18 Green balls and 12 Blue balls. You have to pick 2 blue balls, so the green balls don't matter. You can pick 1 blue ball on 12 ways. The second ball you can pick on 11 ways (because there are 11 balls left). 12 * 11 = 132. So you can pick it on 132 ways. ;)

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2009-07-07 21:56:24
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Q: There are 30 balls out of which 60percent are green balls and rest are blue balls How many ways that you can pick the pair of blue balls?
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