Apparently, this user prefers to keep an air of mystery about them.
1 permutations with a given condition! jul 22
0 Selection minimum out of $n$ different objects! sep 12 '13
0 How to arrange a pile of coins into two piles such that both piles have equal number of heads up? sep 21 '13
0 finding the total number of ways of arranging bulbs! sep 25 '13
0 all possible sequences of positive integers that sum upto N and are strictly increasing sep 29 '13