SOLUTION: what do the symbols stand for which look like an exclamation point! ? and what do the symbol stand for which is a M flipped sideways almost like a backwards E?

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Question 7217: what do the symbols stand for which look like an exclamation point! ? and what do the symbol stand for which is a M flipped sideways almost like a backwards E?
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
5! is shorthand for 5x4x3x2x1, which is called a "factorial"

so, 9! is 9x8x7x6x5x4x3x2x1 etc

Backwards E means "there exists".

I cannot write "backwards E" so i shall write 3 instead:

3x means "there is/are x-values that..." and then you are given some function or qualifier.

Hope that helps.

jon.