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5 x 9 = 5 x 3 x 3
3 x 25 = 3 x 5 x 5
One each of '3' & '5' are common to both multip;lies
Hence 3 x 5 = 15 which is the GCF.
The LCM is 15 x 3 x 5 = 15 x 15 = 225
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