MathProbabilityEvents and probabilities

Finding probabilities

Theory

A telephone number

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You need to call your friend, but you have forgotten the last two digits of the number. You are certain that the next-to-last digit was odd, and the second-to-last digit was either 00, 33 or 77. What is the probability that you will guess the number from your first try? Write your answer in the form of a fraction.

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