What is the unit digit in 7^100? Choose the correct choice from the following answers
A) 0 B) 1 C) 2 D) 3 E) 5
Unit digit in 7^100 = unit digit in [(7^4)^25 ]   1ut unit digit in 7^4=1   unit digit 7^100= 1   Answer is 1
<result>B</result>
What is the unit digit in 7^100?