In how many ways can the letters of the word ABCdef be rearranged such that the lower case letters always appear together?	Choose the most appropriate option:
A) 196
B) 255
C) 299
D) 144
E) 169
ABCdef   def will come together as a group which can be arranged in 3!=6ways.   def,A,B,C can be arranged in 4!=24 ways.   total possible arrangements = 6*24= 
<gadget id="calculator">6*24</gadget>
<output>144</output>
144ways   ANSWER:144
<result>D</result>
In how many ways can the letters of the word ABCdef be rearranged such that the lower case letters always appear together?