Apparently, this user prefers to keep an air of mystery about them.
2 How many four digit numbers, in which all digits are distinct, contain at least one of 2 and 4 and have no leading zeros? mar 26 '14
0 What is the probability that, when 3 couples are seated around a circular table, no couple sits together? may 7 '14
0 Chebyshev Polynomials of 1/n sep 29