How many 6 digit area codes are possible if the first number can't be zero?
Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):
Showing 0 comments:
Be the first to comment!
To solve this example are needed these knowledge from mathematics:
Next similar examples:
- PIN - codes
How many five-digit PIN - code can we create using the even numbers?
- Cars plates
How many different licence plates can country have, given that they use 3 letters followed by 3 digits?
- Bits, bytes
Calculate how many different numbers can be encoded in 16-bit binary word?
In the Hockey World Cup play eight teams, determine how many ways can they win gold, silver and bronze medals.
In how many ways can be divided gold, silver and bronze medal among 21 contestant?
- Olympics metals
In how many ways can be win six athletes medal positions in the Olympics? Metal color matters.
- Morse alphabet
Calculate how many words of Morse code to create compiling commas and dots in the words of one to four characters.
- 2nd class variations
From how many elements you can create 6972 variations of the second class?
How many ways can select 4 fields on classic chess board with 64 fields, so that fields don't has the same color?
- Password dalibor
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?
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?
From the colors - red, blue, green, black and white, create all possible tricolors.
- Task of the year
Determine the number of integers from 1 to 106 with ending four digits 2006.
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.
- Theorem prove
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?
- One half
One half of ? is: ?
Express the expression ? as the n-th power of the base 10.