Find the HCF and LCM of 90, 144 by prime factorisation method.
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90 = 3 x 3 x 2 x 5. H.C.F( 90, 144) = 2 x 3 x 3 = 18. L.C.M( 90, 144) = 2 x 2 x 2 x 2 x 3 x 3 x 5 = 720
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