hcf of 1620 and 420, hcf of 420 and 1782, hcf of 420 and 1512, hcf of 1800 and 420, hcf of 420 and 100, hcf of 200 and 420, hcf of 420 and 18, hcf of 126 and 420, hcf of 420 and 130, hcf of 420 980 and 1260, hcf of 360 and 420, hcf of 1872 and 1320, hcf of 768 and 420, hcf of 12056 and 420, hcf of 140 420 350, hcf of 378 420 180, hcf of 1650 and 1575, hcf-4202
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