Count the special subsets

Probability Level pending

Let us consider a set X = { 1 , 2 , 3 , 4 } X = \{1,2,3,4\} . we know that number of subsets of X X is 16. So the question is how many of these subsets have a complement of size greater than or equal to original subset size?

For example, { 1 } \{1\} is a subset of size 1 whose complement is { 2 , 3 , 4 } \{2,3,4\} has size 3. So out of 16 subsets how many satisfy the condition mentioned above

4 8 10 11

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1 solution

Shivdutt Sharma
Dec 10, 2016

subset of size 0 + subset of size 1 + subset of size 2 = 1 + 4 + 6 =11

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