find the HCF and LCM of 840 and 1260.
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1260=840×1+420
840=420×2+0
therefore HCF=420
LCM=
420=2×7×3×2×5
1260=2×5×2×3×7×3
=2×7×5×2×3×3
=1260
840=420×2+0
therefore HCF=420
LCM=
420=2×7×3×2×5
1260=2×5×2×3×7×3
=2×7×5×2×3×3
=1260
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