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The exclamation sign in maths means FACTORIAL - multiply the number by all numbers less than it to 1.

For Example:

7! means 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5040

same goes with the other non zero positives.

In maths, 0! has been assumed to be ONE.

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Q: What does exclamation mark mean in maths?
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