find de HCF & LCM of 6, 72, &120 using prime factorisation method.
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6=2x3,
72=2x2x2x3x3,
120=2x2x2x3x5,
LCM=2x2x2x2x3x3x5=720
HCF=2x3=6
72=2x2x2x3x3,
120=2x2x2x3x5,
LCM=2x2x2x2x3x3x5=720
HCF=2x3=6
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