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Why polynomial Can't output as single Number?


data={7,2,3,25,1,10};
f=InterpolatingPolynomial[data,x];
f/.x->5;

Result as attachment picture.

why can't get a simply number?

thanks

Please see picture:
http://lh3.google.com/sunose/RO6YrIfQABI/AAAAAAAAAHM/Mv4mNbq31mI/polynomial.JPG

thanks


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