In a group (G, 0) the elements a and b commute. Also O (a) = m and O (b) = n, are prime to each other, then %3D («) O (a.b) = /m %3D (b) O (a.b) = Jmn (c) O (a.b) = mn %3D (d) O (a.b) = L.C.M. of m and n

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