What is the remainder when 43^87 is divided by 5?
Choose the correct answer: A) 0 B) 1 C) 2 D) 3 E) 4
The units digit of the exponents of 3 cycle in a group of 4: {3, 9, 7, 1}   87 has the form 4k+3 so the units digit of 43^87 is 7.   The remainder when dividing by 5 is 2.   The answer is 2.
<result>C</result>
What is the remainder when 43^87 is divided by 5?