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A traveller forgets their passcode consisting of four digits. However, he remembers that his passcode has the following digits in it: 3, 2, 7, 4.

A traveller forgets their passcode consisting of four digits. However, he remembers that his passcode has the following digits in it: 3, 2, 7, 4. Find the total number of trials necessary to obtain the correct passcode if a number is repeated

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