A 5-letter code word consists of letters A, B, and C. If the code includes all the three letters, how many such codes are possible?  Select the correct option:	A) 90	B) 48	C) 36	D) 24	E) 18
Note that the correct answer to this question is 36, not 72.   AB-ABC can be arranged in 5!/2!2!=30 ways;   BC-ABC can be arranged in 5!/2!2!=30 ways;   AC-ABC can be arranged in 5!/2!2!=30 ways;   Total:  30+30+30= 
<gadget id="calculator"> 30+30+30</gadget>
<output>90</output>
90.   90nswer: 90.
<result>A</result>
A 5-letter code word consists of letters A, B, and C. If the code includes all the three letters, how many such codes are possible?