I’m the product of all positive integers up to a certain point, but when you meet me at zero, I hold the line. What number am I?
Category: Math · Difficulty: hard
Hint: Think about the definition of factorials.
Answer
1
Explanation
By definition, 0! = 1, and the factorial of any positive integer n is n! = n × (n-1)!.
This is a hard math riddle — a tricky one that takes a little thought. The answer is 1.
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