How to find no. Of ways to select from a no. Of things available?
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The answer says 4095. Now, as per my understanding :
4095=212−1 == Ways of getting a non-null subset out of 12 elems
That would make sense, but where does the "divided into two sets, each of size 6" play in here ? Why does the answer still stay the same as it would if there was no further division of the bigger set ?
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