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5. Show that if f : R - R is quasiconcave, then G(x) = F[f(x)] is also quasiconcave if F : R - R is

5. Show that if f : R" - R is quasiconcave, then G(x) = F[f(x)] is also quasiconcave if F : R - R is increasing, but G is quasiconvex if F is decreasing

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