Find the HCF of 24, 30 and 42.
6
12
15
20
∴ Factors of 24=2×2×2×3=(23×31)
Factors of 30=2×3×5=(21×31×51)
Factors of 42=2×3×7=(21×31×71)
∴ The product of common prime factors with the least powers =21×31=6
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