# Maths

three different lights flash every 5 seconds, 8 seconds and 12 seconds respectively. if they start at the same time how long will it take for them to flash at the same time again?

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1. common multiple
5
2*2*2
2*2*3
need
5 2 2 2 3
120

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2. three different lights flash every 8 seconds every 5 seconds and every 12 seconds

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