AoPS Wiki:Problem of the Day/September 2, 2011
How many ways are there to rearrange the letters of the word "uncopyrightable?"
This Problem of the Day needs a solution. If you have a solution for it, please help us out by adding it. 1,307,674,368,000
The answer is 15! because all the letters are different. so 15x14x13x12x11x10x9x8x7x6x5x4x3x2x1 = 1,307,674,368,000