4^15 is equal to which of the following?
Pick one.
A) 1,073,751,828  B) 1,073,751,824  C) 1,073,751,842  D) 1,073,751,806  E) 1,073,751,821
Given that the answers have different last digits, there are several ways to solve this, but the most straight forward way is to check the algorithm. 4^n has a cycle of 1.   4^1 = 4   4^2 = 16   4^3 = 64   Observe that the last digit of the resultant of 4^1 and 4^3 is 4. If we continue 4^n, the last digit follows the pattern 4, 6, 4, 6, 4, 6, .... So, all we need look for is the last digit in the pattern.   Cycle of 1, power of 15, last digit is 4.   Answer: 1,073,751,824
<result>B</result>
4^15 is equal to which of the following?