What is the unit digit in 12^100? Choose the correct option.
A) 0
B) 1
C) 2
D) 4
E) 6

Rationale: unit digit in 12 ^ 100 = unit digit in [ ( 12 ^ 4 ) ^ 25 ] but unit digit in 12 ^ 4 = 6 unit digit 12 ^ 100 = 6 answer is e
Answer: E