Area codes

How many 6 digit area codes are possible if the first number can't be zero?

Result

n =  900000

Solution:

Solution in text n =







Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




To solve this example are needed these knowledge from mathematics:

Would you like to compute count of combinations? See also our variations calculator.

Next similar examples:

  1. PIN - codes
    pin How many five-digit PIN - code can we create using the even numbers?
  2. Cars plates
    car_plate How many different licence plates can country have, given that they use 3 letters followed by 3 digits?
  3. Bits, bytes
    bits Calculate how many different numbers can be encoded in 16-bit binary word?
  4. Metals
    metals_2 In the Hockey World Cup play eight teams, determine how many ways can they win gold, silver and bronze medals.
  5. Medals
    medails In how many ways can be divided gold, silver and bronze medal among 21 contestant?
  6. Olympics metals
    olympics In how many ways can be win six athletes medal positions in the Olympics? Metal color matters.
  7. Morse alphabet
    morse_code Calculate how many words of Morse code to create compiling commas and dots in the words of one to four characters.
  8. 2nd class variations
    cards From how many elements you can create 6972 variations of the second class?
  9. Chess
    sachovnica How many ways can select 4 fields on classic chess board with 64 fields, so that fields don't has the same color?
  10. Password dalibor
    lock Kamila wants to change the password daliborZ by a) two consonants exchanged between themselves, b) changes one little vowel to such same great vowel c) makes this two changes. How many opportunities have a choice?
  11. Neighborhood
    glasses_1 I have 7 cups: 1 2 3 4 5 6 7. How many opportunities of standings cups are there if 1 and 2 are always neighborhood?
  12. Tricolors
    Flag_of_the_Netherlands.svg From the colors - red, blue, green, black and white, create all possible tricolors.
  13. Task of the year
    years Determine the number of integers from 1 to 106 with ending four digits 2006.
  14. Variations
    pantagram Determine the number of items when the count of variations of fourth class without repeating is 42 times larger than the count of variations of third class without repetition.
  15. Theorem prove
    thales_1 We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
  16. One half
    one_half One half of ? is: ?
  17. Powers
    1power Express the expression ? as the n-th power of the base 10.