Question

A letter lock contains 3 rings each ring containing 5 different letters determine the maximum number of trials that can be made before lock is opened

Answer 1

Since each ring consists of five different letters, the total number of attempts possible with the three rings is = 5×5×5 = 125. Of these attempts, one of them is a successful attempt.

Maximum number of unsuccessful attempts = 125 - 1 = 124

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