What is the unit digit in 4^100?
Pick.
A) 0	B) 1	C) 6	D) 3	E) 5
Unit digit in 4^100 = unit digit in [(4^4)^25 ]
But unit digit in 4^4=6
unit digit 4^100= 6
Answer is 6
<result>C</result>
What is the unit digit in 4^100?