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Q. H.C.F . of 1/2, 3/4, 5/6, 7/8, 9/10 is ?
H.C.F = ( H.C.F of 1, 3 , 5, 7, 9) / (L.C.M of 2, 4, 6, 8 , 10) = 1 / 120
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