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Given the set $A = \{0, 1\}^8$, how can I find the set of all elements in A with exactly 4 zero entries?

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    What do you mean by *find*?2012-10-31
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    Sorry about the ambiguity. I am trying to obtain every element in A with four zero entries. For example, $(0,1,0,0,1,0,1,1)$.2012-10-31
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    I understand which of the elements of $A$ you want; I just don’t know in what sense you want to *find* them. Do you want notation for describing that subset of $A$? Do you want an algorithm for going through $A$ and picking them out? Or what?2012-10-31
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    I am looking for some notation to describe that subset. Apologies!2012-10-31

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