Five light buttons blink at the interval of 6 s, 7 s, 8 s, 2 s, 3 s re – McqOptions

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1.	Five light buttons blink at the interval of 6 s, 7 s, 8 s, 2 s, 3 s respectively. If they start blinking together, then how many times would they have blinked together in an hour?
A.	24
B.	18
C.	21
D.	20
Answer» D. 20

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