The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m., at what time will they change together next ?

LCM Using Prime Factorisation Method, Irrationality of Square Root of Prime Numbers | PadhAiPro

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TextLCM Using Prime Factorisation MethodIrrationality of Square Root of Prime NumbersCBSE PYQ

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If two positive integers p and q can be expressed as p = 18 a²b⁴ and q = 20 a³b², where a and b are prime numbers, then LCM (p, q) is :

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Assertion (A) : For two prime numbers x and y (x < y), HCF(x, y) = x and LCM(x, y) = y. Reason (R) : HCF(x, y) ≤ LCM(x, y), where x, y are any two natural numbers.

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