If it is late its ok but if it was period then bleeding you might want get it checked out you might have a vaginal infection.
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If your question refers to the Geometric Mean of 9 and 11 then the GM of any two numbers is √ab. Then the GM of 9 and 11 = √(9 x 11) = √99 = 9.9499 (5sf)
Eleven
Just what ever you mean by what you say :Chemistry 11 Stiochiomertry.
11 players on a football team
There are an infinite number of sets of numbers. 9,10 an 11 9,9,10,11 and 11 9,9,9,10,11,11 and 11 etc, for example, is one family of sets of numbers.