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your friend purchased a medium pizza for $10.31 with with a 30% off coupon. What is the price of a medium pizza without a coupon
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There are 10 possible digits and 26 possible letters.
To find the answer to this problem we have to multiply 9 as many digits has the hotel reservation number and 26 as many letters it has.
It means:
There are 1,119,214,746 possible reservation numbers.