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It is not possible to give an accurate answer to this question because not all number are used and those that are, are not issued randomly. For example, some sequences are reserved for the start of mobile or cell phone numbers, other sequences for toll free or premium rate numbers.

But, if you assume that all numbers are equally likely to be used, then the answer is (1/10)*(1/10) = 1/100

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Q: What fraction of telephone numbers begins with 9 and ends with 0?
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