In how many ways we can place $N$ mutually non-attacking knights on an $M \times M$ chessboard?
asked Feb 15 '13 at 15:33
Given $A$ and $B$, how many positive integers $N$ such that $N\times B$ has at least one divisior $D$ that lies in $N \lt D \le A$?
asked Feb 15 '13 at 16:01
No answers with score of 5 or more