What is the units digit of the expression 13^27 +1? Choose the correct option
A) 1	B) 3	C) 4	D) 8	E) 9
Power of 3 follows repetition pattern of = 3, 9, 7, 1, 3, 9, 7, 1 ....   Repetition after 4 powers = (3, 9, 7, 1)   13^27 = 27th Power = 24+3   24/4= 
<gadget id="calculator">24/4</gadget>
<output>6</output>
6 (6 repetitions) + 3= "7"    7+1= 
<gadget id="calculator"> 7+1</gadget>
<output>8</output>
8   Answer 8
<result>D</result>
What is the units digit of the expression 13^27 +1?