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- A letter lock consists of three rings each marked with six different letters.
Question 1:
A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most? A. 216
B. 243
C. 215
Feedback Since each ring consists of six different letters, the total number of attempts possible with the three rings is = 6 * 6 * 6 = 216. Of these attempts, one of them is a successful attempt.
Maximum number of unsuccessful attempts = 216 - 1 = 215.
Maximum number of unsuccessful attempts = 216 - 1 = 215.
D. 729
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