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Answer :
The next time all three lights will flash at the same time will be in 210 seconds, or 3 minutes and 30 seconds.
How to find the next time all three lights will flash at the same time
To find the time at which all three lights will flash at the same time, we need to find the LCM (Least Common Multiple) of the given times.
Prime factorizing each time, we get:
6 = 2 x 3
15 = 3 x 5
21 = 3 x 7
To find the LCM, we take the highest power of each prime factor that appears in any of the numbers:
2 x 3 x 5 x 7 = 210
Therefore, the next time all three lights will flash at the same time will be in 210 seconds, or 3 minutes and 30 seconds.
Learn more about lowest common multiple at:https://brainly.com/question/28109219
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