What is the unit digit in (4137)^754?  Choose one
A) 1 B) 3 C) 7 D) 9 E) None of these
Unit digit in (4137)^754=unit digit in {{(4137)^4}^188 * (4137)^2}=(1*9)= 
<gadget id="calculator">(1*9)</gadget>
<output>9</output>
9.   Correct Option: 9
<result>D</result>
What is the unit digit in (4137)^754?