Find the number of trailing zeros in a factorial
Find the largest volume of a cylinder cut and formed from a sheet of paper
How many 8 × 8 chess boards are embedded in a painting which consists solely of black and white squares, arranged in a checkered pattern
Answers and techniques for solving the Impossible Test Christmas. Revised for newest version 1/17/2013
Comparing four-sided and six-sided dice
Find the sum of the distinct square-free numbers in the first 51 rows of Pascal’s triangle.
Find the unique positive integer for a concealed square.
Skew-cost coding
Tribonacci non-divisors
An Arithmetic Geometric sequence