Norrie sees two lights flash at the same time, then one
of them flashes every 4th...
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Norrie sees two lights flash at the same time, then oneof them flashes every 4th second, and the other flashes every 5thsecond. How many times do they flash together during a wholeminute?
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Let us assume Norrie sees two lights flash at the same time attime0 secFrequency of first flash I Every 4th secondFrequency of second flash II Every 5th secondLet us
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