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Question

Playing with number,LCM and HCF.In one of the video it is said to find LCM of three numbers in division method step one says find a number that is a factor of at least two number .So to find the LCM of 3,5,7 in division method what should I do

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Solution

STEPS :1. Arrange the given numbers in a line in any order.2. Divide by a number which exactly divides at least 2 of the given numbers and carry forward the numbers that are not divisible.3. Repeat the above process till no two of the numbers are divisible by the same number other than 1.4. The product of the divisors and the undivided numbers is the required LCM.Now, the given numbers are 3, 5 and 7.We see that no two of the numbers are divisible by the same number other than 1.Hence, LCM of 3, 5 and 7 = 3 ×5×7 = 105

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