(A) n1x1 + n2x2x + _____ nuxu/n1 +n2 + ___ + nu
(B) n1x1 + n2x2x + _____ nuxu/x1 + x2 + ____ x4
(C) n1x1 + n2x2x + _____ nuxu/n1 + n2 + ___+ nu
(D) Σn1x/x1
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(A) n1x1 + n2x2x + _____ nuxu/n1 +n2 + ___ + nu
(B) n1x1 + n2x2x + _____ nuxu/x1 + x2 + ____ x4
(C) n1x1 + n2x2x + _____ nuxu/n1 + n2 + ___+ nu
(D) Σn1x/x1