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Accuracy in the function N[expr, n]

Hi MathGroup members,

While doing numerical search, I came to deadlock;

     F = N[CDF[NormalDistribution[0,1], 18], 100]

Mathematica returns 1. and 16, 
but I want to increase the number of significant digits of F.

Though I use the function N[expr, 100], 
why can't I get the 100-digits accuracy?

Thanks in advance.
Hyunho Shin (shinhh at


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