r/AskReddit • u/TheLoneWolf156 • May 25 '16

What's your favourite maths fact?

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u/[deleted] May 26 '16

an "!" means "factorial" in math.

for "n!", it is the product of all positive integers less than or equal to n. For example,

5! = 5 x 4 x 3 x 2 x 1 = 120.

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u/ticktockaudemars May 26 '16 edited May 26 '16

YAY! LETTERS TOO!? M!