Due to the growing population, a new High School was built. In this New highschool was 1000 lockers for the students and of course the lockers were numbered one through one thousand. During recess a school wide experiment/project was planned among the students and teachers. At the beginning of school the first student was to come in and open all the lockers. The second was to close all the even numbered locker. The third was to change all of the lockers that were multiples of three.(Change as in, closing the open locker and opening the closed locker.) The fourth will to do the same except to lockers with multiples of four and so on. After all 1000 students have entered the school. which lockers will be opened and why? Sorry, but i don't have the answer to this. Have fun!