If n = 9^11 – 9, what is the units digit of n? Pick:  A) 0  B) 1  C) 4  D) 6  E) 8
Always divide the power (incase 11) by 4 and use the remainder as the new power. The question now becomes 9^3 - 9. Now 9^3 has last digit 9. , we subtract 9 from 9 , thus 9 -9= 
<gadget id="calculator">9 -9</gadget>
<output>0</output>
0 is the answer. Option 0
<result>A</result>
If n = 9^11 – 9, what is the units digit of n?