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? Select:
A) 277 B) 269 C) 215 D) 177 E) 123
Since each ring consists of six different letters, the total number of attempts possible with the three rings is   = 6 * 6 * 6= 
<gadget id="calculator">6 * 6 * 6</gadget>
<output>216</output>
216. Of these attempts, one of them is a successful attempt.   Maximum number of unsuccessful attempts= 216 - 1= 
<gadget id="calculator">216 - 1</gadget>
<output>215</output>
215.   Answer:215
<result>C</result>
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?