A. n1x1 + n2x2x + _____ nuxu/n1 +n2 + ___ + nu B. n1x1 + n2x2x + _____ nuxu/x1 + x2 + ____ x4 C. n1x1 + n2x2x + _____ nuxu/n1 + n2 + ___+ nu D. ∑n1x/x1 Advertisement Advertisement