Oh, what a happy little question! When you multiply 10 by itself 10 times, you get 10 billion. Isn't that just the most beautiful number to work with? Just imagine all the wonderful things you could create with that kind of number!
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1000000000
1010x1.65 10x10x10x10x10x10x10x10x10x10=10 billionx1.65=16500000000
The counting principle works like this.Multiply the number of choices you have for each character.If you can have 0000000000 then you would multiply 10x10x10x10x10x10x10x10x10x10 or 10,000,000,000.10 billion.If you eliminate that number that there is one less.
Oh, dude, you're asking about combinations now? That's like asking me to count all the grains of sand on a beach. There are like a bazillion combinations for those numbers, so good luck with that. Just remember, math can be a real party pooper sometimes.
It depends on the capacity of the networks server. In the UK we recently had an overhaul of the dialling codes system, as they were running out of codes. With the introduction of better computer systems, BT was able to increase the capacity of the network (using the new codes) to provide enough capacity for at least the next 20 years.