Brain Teasers
How Many Books?
John has 15 books, and poses himself with a challenge: ''If I placed each book side by side, I wonder how many different combinations I could arrange these books in...''.
How many combinations are there?
How many combinations are there?
Answer
130767436800015x14x13x12x11x10x9x8x7x6x5x4x3x2x1=1307674368000
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