1575
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1 and 25,200 respectively.
63 = 3 x 3 x 7, so there are more than one combination: 7 & 9 and 21 & 9. That should be it, unless you want to consider the somewhat trivial combinations : 63 & 21, 63 & 9, 63 & 3, 63 & 7.
The LCM is: 2,475
The LCM (Least Common Multiple) of 16, 63, and 75 is the smallest number that is divisible by all three numbers without leaving a remainder. To find the LCM, you can prime factorize each number and then multiply the highest power of all prime factors present. The GCF (Greatest Common Factor) of 16, 63, and 75 is the largest number that divides all three numbers without leaving a remainder. To find the GCF, you can also prime factorize each number and then multiply the lowest power of all common prime factors present.
The LCM is 675.