there are 380 light bulbs lined up in a row in a long room. Each bulb has its own switch and is currently switched off. each bulb is numbered conseciteveley from 1 to 380. you first flip every switch. you then flip the switch on every second bulb 2,4,6 you then flip the switch on every third bulb 3,6,9 this continues until you have gone through the process 380 times.
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