How many numbers are there in the numeric digits?

Question

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Answer 1

If I understand your question, there are 10 - from 0 to 9 - but they can express an infinite number of combinations.
In computing:
"The numeric digits setting identifies the number of significant digits that are produced by numeric computations. The number of digits is set to the value of the digitsExpression. When the digitsExpression is absent, the number of digits is set to the default setting -- 9 digits. The value of the digitsExpression must be a positive whole number which exceeds the current numeric fuzz setting."