☰ Contents1.2 · The Fundamental Theorem of Arithmetic29/101

Worked: 6 and 20

6 = 2 × 3 and 20 = 22 × 5. The only common prime is 2, smallest power 21 → HCF = 2. Every prime at its greatest power: 22 × 3 × 5 → LCM = 60.

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Find the HCF and LCM of 26 and 91.