Came across this picture of an interesting clock face…

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Finally a clock anyone can read!

Herb

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I understood all but the numeral for 5 o’clock. I must have been absent that day in class. The ! , is new to me.

Herb

! is a mathematical symbol for a factorial…

the square root of 9 is 3…

3! = 6… (factorial of 3)

9 ÷ 9 =1

6 - 1 = 5

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