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The number of subsets of a given set, including the set itself and the empty set, is 2n.

Easiest way to see why: to make a particular subset, for each element in the original set you either chhose it or you don't. There are thus two possibilities for each element, so 2n possibilities for all n elements.

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โˆ™ 2012-06-18 09:22:58
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Q: How many subsets are there in a set?
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