Who is Smarter?
The two friends, Facto and Rial, cannot decide who is smarter so they devise a test: one of them will create a math problem and the other will attempt to solve it. If they do, they will be titled as smart, but if not, the creator of the problem will assume the reputation of being smart.
Facto: "What is the product of 2 and 9!?"
Rial: "I believe that would be 11."
Rial is incorrect. What would the correct answer be?
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1 solution
Facto + Rial = Factorial (a hint)
The product of 2 and 9! = 2 × 9! = 725760 (the correct answer).
If the sentence were to have the meaning of '!?' or '?!', you would use an interrobang (‽) or just one form of punctuation.
x! means factorial (e.g. 3! = 1 × 2 × 3 = 6), where x represents a variable.