Recent questions tagged tifr2010

21 votes
3 answers
7
13 votes
2 answers
21
40 votes
5 answers
23
Let $X$ be a set of size $n$. How many pairs of sets (A, B) are there that satisfy the condition $A\subseteq B \subseteq X$ ?$2^{n+1}$$2^{2n}$$3^{n}$$2^{n} + 1$$3^{n + 1}...
10 votes
3 answers
28