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Why polynomial Can't output as Number?

• To: mathgroup at smc.vnet.net
• Subject: [mg68954] Why polynomial Can't output as Number?
• From: "William wang" <sunose at gmail.com>
• Date: Thu, 24 Aug 2006 03:40:03 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

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