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Prime Factors, HCF and LCM

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Question 4

Light A flashes every 5 seconds.
Light B flashes every 6 seconds.
Light C flashes every 7 seconds.

All three lights flash at the same time.

Work out how long it will take for all three lights to flash at the same time again.

[3]

Prime Factors, HCF and LCM Questions

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  3. /Prime Factors, HCF and LCM