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Recent questions tagged subsets

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ISI2015-MMA-5
A set contains $2n+1$ elements. The number of subsets of the set which contain at most $n$ elements is$2^n$$2^{n+1}$$2^{n-1}$$2^{2n}$
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ISI2016-MMA-13
Which one of the following statements is correct regarding the elements and subsets of the set $\{1, 2, \{1, 2, 3\}\}$?$\{1, 2\} \in \{1, 2, \{1, 2, 3\} \}$$\{1, 2\} \sub...
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