Question: How to have Maple recognizing an expression drawn from a list?

I tried the following:

utility:=[CARA,CRRA,DARA]:

DARA1:=alpha+beta*x:

eval(utility[3]||1,[alpha=1,beta=2]);

 

Unfortnuately Mape ouputs: utility[3]||1

How can I get Maple to recognize the expression behind utility[3]||1?

Thanks for helping.

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