A 4-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) 72
B) 48
C) 36
D) 24
E) 18
3 letters A, B and C can be arranged in 3! ways = 6 ways   4th letter can be chosen in 3 ways   Total number of ways = 6*3= 
<gadget id="calculator">6*3</gadget>
<output>18</output>
18   ANS 18: 18
<result>E</result>
A 4-letter code word consists of letters A, B, and C. If the code includes all the three letters, how many such codes are possible?