What number is obtained by adding the units digits of 734^99 and 347^83? Choose the correct choice from the following answers:
A) 7
B) 8
C) 9
D) 10
E) 11
The units digit of 734^99 is 4 because 4 raised to the power of an odd integer ends in 4.   The units digit of 347^83 is 3 because powers of 7 end in 7, 9, 3, or 1 cyclically. Since 83 is in the form 4n+3, the units digit is 3.   Then   4+3= 
<gadget id="calculator">  4+3</gadget>
<output>7</output>
7.   The answer is 7.
<result>A</result>
What number is obtained by adding the units digits of 734^99 and 347^83?