A locker consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most? Pick one:	A) 200	B) 215	C) 220	D) 223	E) 224
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   215
<result>B</result>
A locker consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most?