How many 7-digit telephone numbers can be compiled from the digits 0,1,2,..,8,9 that no digit is repeated?
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:
How many ways are there to arrange 6 books on a shelf?
How many rectangles with area 3002 cm2 whose sides is natural numbers are?
- No. of divisors
How many different divisors has number ??
- Bridge cards
How many bridge hands are possible containing 4 spades,6 diamonds, 1 club, and 2 hearts?
- Dd 2-digit numbers
Find all odd 2-digit natural numbers compiled from digits 1; 3; 4; 6; 8 if the digits are not repeated.
How many ways can 7 people sit on 2 numbered chairs (eg seat reservation on the train)?
How many different flags can be made from colors red, blue, green, white, yellow so that each flag consisted of three different colors?
- 2nd class variations
From how many elements you can create 6972 variations of the second class?
- Morse alphabet
Calculate how many words of Morse code to create compiling commas and dots in the words of one to four characters.
In how many ways can 5 shuttle vans line up at the airport?
At the table sit 8 people, 4 on one side and 4 on the other side. Among them are 3 pairs. Every pair wants to sit opposite each other. How many ways can they sit?
- 7 heroes
5 heroes galloping on 5 horses behind. How many ways can sort them behind?
- Playing cards
How many possible ways are to shuffle 6 playing cards?
How many ways can 8 guests sit down on 10 seats standing in a row?
- Football league
In the 5th football league is 10 teams. How many ways can be filled first, second and third place?
What is the probability that a random word composed of chars H, T, M, A will be MATH?
We throw 10 times a play dice, what is the probability that the six will fall exactly 4 times?