Note: This diagram shows 360 lightbulbs instead of 100. There is a room with 100 lightbulbs numbered from 1 to 100 in order. Person 1 flicks the switch to each lightbulb which its number is divisible by 1. Person 2 does the same except for numbers divisible by 2. It goes on until Person 100. Which lightbulbs will be on? Scroll down to see the answer The answer is the square numbers from 1 to 100. This is because square numbers have odd number of factors, thus its switch is flicked an odd number of times, which results in it being on. Pretty surprising huh?
This should be more famous ngl
