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Which of the following utility functions have a diminishing marginal utility for good $x$ ?

Select ALL that apply.

A

$U(x)=x^2+2x+1$

B

$U(x)=x^{1/2}$

C

$U(x)=ln(x)$

D

$U(x,y)=x^2 + y^2$

E

$U(x,y)=x^2 y^2$

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