It means that the (telecoms) operator of your country defines certain nos. (usually from foreign countries or public phones) not to show the number on the receiver's phone. They modify this feature on one of their network elements so that the calling number is unknown to other operators thus "no number" occurs.
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If you mean what do you call a number with only 1 and itself as factors, then it is a prime number.
peevee
Count the number of elements in the set - call this number n. Add up all the numbers in the set - call this total t Then mean = t/n
The natural log of a number is some other number such that if you take e (2.718281828...) and raise it to that other number you would get the first number. Another way to say this is that a natural log is a log with base e. The common log of a number is some other number such that if you take 10 and raise it to that other number you would get the first number. The natural log base, e, is a special transcendental number, chosen so that the derivative (respect to x) of ex is equal to ex . In other words, the slope of a tangent line to the curve y = ex at point (x, ex) is equal to ex for all x
Nothing. It's "easy as falling off a log," and it means just what it seems to mean -- something is just as easy as it is to fall off a round log.