A customer forgets a four-digit code for an Automatic Teller Machin...

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Published on ● Video Link: https://www.youtube.com/watch?v=EDqc6NmfLDQ


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A customer forgets a four-digit code for an Automatic Teller Machine (ATM) in bank. However, he remembers that this code consists of digits \( 3,5,6 \) and \( 9 \). Find the largest possible number of trials necessary to obtain the correct code.
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