Question: A PIN code is unique and involves seven characters. The first five characters must be letters, and the last two characters must be numbers. Repetition

A PIN code is unique and involves seven characters. The first five characters must be letters, and the last two characters must be numbers. Repetition is allowed, but the letters R, G, Z, and the number 9, and 7 cannot be used. What is the probability of getting the correct PIN code

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