what is the units digit of the expression 7^75+6?  Answers:
A) 1	B) 3	C) 5	D) 7	E) 9
7 in power repeats pattern of 4: 7-9-3-1. As 75=4*18+3 then the last digit of 7^75 is the same as the last digit of 7^3, which is 3.   Units digit of 7^75+6 will be:  3 + 6= 
<gadget id="calculator"> 3 + 6</gadget>
<output>9</output>
9.   answer is 9
<result>E</result>
what is the units digit of the expression 7^75+6?