A character lock consists of three rings each marked with six different characters. The number of distinct unsuccessful attempts to open the lock is at the most ?	Choose the correct choice:	A) 215	B) 200	C) 235	D) 255	E) 245
six different chars =&gt; tot attempts possible with three rings = 6*6*6   =&gt;max unsuccessful attempts = 216-1= 
<gadget id="calculator">216-1</gadget>
<output>215</output>
215   215NSWER 215
<result>A</result>
A character lock consists of three rings each marked with six different characters. The number of distinct unsuccessful attempts to open the lock is at the most ?