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About N in Mathematica 4


I've a question about the function N in Mathematica 4. I haven't found
information about this problem.

The question is: why if I use N[Pi,30] I'll have a number of 30 decimal
digits, but with N[Pi,10] or N[Pi,3] I'll get a number of 6 digits?

The right number of digits is given only if I use a precision bigger than
the precision of the machine. But if I want a number of 3 decimal digits?


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