Find the greatest common divisor (HCF) of 84 and 126.
Note
Prime factors: 84 = 2^2×3×7, 126 = 2×3^2×7; common factors 2×3×7 = 42, so HCF = 42.
Find the greatest common divisor (HCF) of 84 and 126.
Prime factors: 84 = 2^2×3×7, 126 = 2×3^2×7; common factors 2×3×7 = 42, so HCF = 42.