题目:If n is a prime number greater than 3, what is the remainder when n的平方is divided by 12?
问题:当管老师解题时,他出了3个方程式,分别是:
1) n=3A+1, n的平方=9A(square)+6A+1
2) n=3A+2, n的平方=9A(square)+12A+4
3) n=2A+1, n的平方=4A(square)+4A+1
我不明白的点是:这3个方程式是怎么推到或者是一看到题目就这么设出来的?
What is the median number of employees assigned per project for the projects at Company Z?
1, 25 percent of the projects at Company Z have 4 or more employees assigned to each project.
2,35 percent of the projects at Companny Z have 2 or fewer employees assigned to each project.