They don't all start with 9. Mine doesn't.
There are no reliable statistics on the total number of telephone numbers.
51,52,53,54,55,56,57,58,59.
All Irish (Republic) mobile phone numbers start with 08 and the following digit denotes the network operator the number was originally registered with. Example 08 5(meteor network) 2993856
3 digit numbers are lessthan 4 digit numbers
1000 to 1999 = 1,000 numbersDo the same for 3xxx, 5xxx, 7xxx, and 9xxx,and you wind up with 5,000 numbers in all.
no well my number dosent and i an in the UK
Start at 100 and go on till you reach 999 then stop.
There is no such ratio that applies for all single-digit and double-digit integers.
111 and 201
Actually, it doesn't. At least, it is not 10 digits all over the world. For example, in Bolivia, the mobile phone number has only 8 digits. The number of digits required (for any particular country) can depend on the following:The number of mobile phones (or similar devices) used. If in some country you have, say, 5 million mobile devices, you need at least seven digits.Mobile numbers may have to start with certain digits. This may require an additional digit. In the above example, if in a country all mobile phone numbers start with 6, 7 or 8, then 7 digits are no longer enough - the minimum requirement is 8 digits.The numbers may be organized so that the first few digits identify the phone company, or the geographical region. This also tends to increase the number of digits, since some areas will have few numbers, while others will have many.
89999 5-digit numbers are there in all... That is the numbers from 10000 to 99999... Wrong. There are 90000 five digit numbers in all. When you start to count you count from 10001 to 99999which is 89999 numbers. To that you add the one number 10000. 89999+1=90000
The first thing to do is find how many possible combinations of those numbers match the criteria. All numbers that start with 7 match it. And there are 5x4x3=60 possible numbers that start with 7. All numbers that start with 5 also match it, and there are 5x4x3=60 numbers that start with 5. All numbers that start with 35, 37 or 39 match it. And there are 4x3x3=36 numbers that do this. And finally, all numbers that start with 325, 327 and 329 match it, and there are 3x3=9 numbers that do this. In total this is 60+60+36+9=165 possible 4 digit numbers that match the criteria. The number of possible four digit numbers in total is 6x5x4x3 = 360. This means the probability of a 4 digit number using only 1,2,3,5,7 and 9 being greater than 3251 but less than 8825 is 165/360 which can be simplified to 11/24.