A Person Puts Inside A Hat 30 Slips Of Paper With The Numbers 1 To 30 Printed On

A person puts inside a hat 30 slips of paper with the numbers 1 to 30 printed on each slip.  The hat is shaken vigorously and a slip of paper is chosen. What is the probability that the number on the slip is less than 10 or greater than 20?

You can also write the answer as an unreduced fraction.

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