What is the unit digit in 7^105 ?	Pick one:
A) 9  B) 7  C) 3  D) 8  E) 5
Unit digit in 7^105 = Unit digit in [ (7^4)^26 x 7 ]   But, unit digit in (7^4)^26 = 1   Unit digit in 7^105 = (1 x 7) = 7.   Answer 7) 7.
<result>B</result>
What is the unit digit in 7^105 ?