Shubham has forgotten his friend’s 8-digit telephone number but remembers the following: (a) The first 3 digits are either 305 or 936. (b) The digit 0 occurs exactly three times and the digit 5 occurs exactly once. (c) The number is an even number.
If Shubham wants to reach his friend, what is the maximum number of trials he has to make to be sure to succeed?
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