what is the HCF and LCM of two prime numbers A and B three alarm clock night at intervals of 69 15 minutes respectively if they start ringing together after what time will the next ring together
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Step-by-step explanation:
1)hcf of 2 prime no.s, a and b = 1
lcm of 2 prime no.s, a and b = ab
2) the three clocks will ring again together after lcm ( 6, 9 , 15)
i.e . after 90 mins.
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