using prime factorisation find HCF and lcm of 72,126,168
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72 = 2³ × 3²
126 = 2 × 3² × 7
168 = 2³ × 3 × 7
HCF = product of common terms with lowest power
==> HCF = 2 × 3
==> HCF = 6
LCM = product of prime factors with highest power
==> LCM = 2³ × 3² × 7
==> LCM = 504
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HCF AND LCM OF 72 126 168
FACTORS OF - 1)72 = 2*2*2*3*3
2)126 = 2*3*3*7
3)168 = 2*3*3*3*3
HCF = 2*3*3 = 18
LCM = 4536
Step-by-step explanation:
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