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# From a set of six elements, how many different subsets can

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Joined: 24 Jun 2003
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From a set of six elements, how many different subsets can [#permalink]  08 Aug 2003, 00:09
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From a set of six elements, how many different subsets can be arranged consisting of
a) four elements each;
b) at least four elements each;
c) at most four elements each?
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Joined: 03 Feb 2003
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(a) 6C4
(b) 6C4+6C5+6C6
(c) 6C0+6C1+6C2+6C3+6C4

6C0=1 is a void set. Does it satisfy (c)?
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