Since the numbers begin with 123, they all contain a 3. As a result, they all "contain 3 or 7".
So the remaining 4 digits can be any digits and this gives 104 = 10,000 such numbers.
Credit cards have a series of 14-16 digits, beginning with the numbers 3, 4, 5 or 6. American Express cards begin with 3 and have 15 digits. Diners Club and Carte Blanche (JCB) cards begin with 3 and have 14 or 16 digits. Visa cards begin with 4 and have 16 digits. (Old cards used to have 14 digits). Mastercard cards begin with 5 and have 16 digits. Discover cards begin with 6 (usually 6011) and have 16 digits.
because the switches were hard-wired together and fairly hard to re-wire telephone exchange buildings in many larger cities in north America were dedicated circuits that begin with the first two or three digits of the standard 7 to the phone numbers .
Right because you start with the number that begins
24, of which 6 will begin with zero. Excluding these, gives 18.
2
The telephone country code for Australian research bases in Antarctica is +672. Numbers in the Mawson base begin with +672 117, with a further three digits.
Djibouti is country code +253. Landlines in the city of Djibouti begin with +253 21. Landlines in the outer districts begin with +253 27. Mobile numbers begin with +253 77. All numbers have 8 digits following the country code +253. Note that all telephone numbers in Djibouti changed in March 2012. See the related links for details.
Macau is country code +853. There are no area codes within Macau. Most numbers are 8 digits after the country code +853. Most ordinary landline numbers begin with +853 2. Direct dial-in numbers begin with +853 8. Most mobile numbers begin with +853 6.
El Salvador is country code +503. There are no city codes or area codes. Landline numbers begin with +503 2. Mobile numbers begin with +503 6 or +503 7. The local number is 8 digits, except for freephone and premium-rate numbers.
Credit cards have a series of 14-16 digits, beginning with the numbers 3, 4, 5 or 6. American Express cards begin with 3 and have 15 digits. Diners Club and Carte Blanche (JCB) cards begin with 3 and have 14 or 16 digits. Visa cards begin with 4 and have 16 digits. (Old cards used to have 14 digits). Mastercard cards begin with 5 and have 16 digits. Discover cards begin with 6 (usually 6011) and have 16 digits.
Toll-free numbers in India begin with 1800.
Niger is country code +227. Landline numbers begin with +227 20. Fixed wireless numbers begin with +227 21. Mobile numbers begin with +227 9.
The former Soviet republic of Georgia is country code +995.When calling from other countries, you must omit the trunk prefix '0' from the beginning of the Georgian domestic number. For example, Tbilisi's area code 032 becomes +995 32. Landlines in eastern Georgia begin with +995 3; landlines in western Georgia begin with +995 4. Mobile numbers begin with +995 5.Substantial changes to telephone numbers in Georgia took effect in 2011. Local numbers in Tbilisi are now 7 digits, and local numbers elsewhere in Georgia are now 6 digits.(This information is about the Eurasian country Georgia, not the U.S. state of Georgia. The United States uses country code +1.)
You can consult their telephone guide. Usually, Puerto Rican numbers begin in 787 or in 939.
61 is the Country Code for Australia, but no Australian phone Area Code numbers begin with a 6, so no numbers will begin 61642...
Most telephone numbers in Destelbergen, Belgium, begin with 09, which is +32 9 in international format.
Landline telephone numbers in Kos, Greece, begin with 22420, or +30 22420 in international format.