Q35 of 140 Page 276

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

Given: code consists of digits 3, 5, 6, 9.


To find: the largest possible number of trials necessary to obtain the correct code.


The customer remembers that this 4 digit code consists of digits 3, 5, 6, 9.


So the largest possible number of trials necessary to obtain the correct code=4!=4 × 3 × 2 × 1=24


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