Combinatorics - examples
- Combinations 7
A multi-course meal has 3 choices. 3 appetizers, 4 main courses, and 3 desserts. How many different combinations to choose from?
- How many 2
How many three lettered words can be formed from letters A B C D E G H if repeats are: a) not allowed b) allowed
- Left handed
It is known that 25% of the population is left-handed. What is the probability that there is a maximum of three left-handers at a seminar where there are 30 participants?
- Component fail
There is a 90 percent chance that a particular type of component will perform adequately under high temperature conditions. If the device involved has four such components, determine the probability that the device is inoperable because exactly one of the.
- Prime number
Jan wrote any number from 1 to 20. What is the probability that he wrote the prime number?
- No. of divisors
How many different divisors has number ??
In rectangle with sides 3 and 10 mark the diagonal. What is the probability that a randomly selected point within the rectangle is closer to the diagonal than to any side of the rectangle?
- 7 heroes
9 heroes galloping on 9 horses behind. How many ways can sort them behind?
From complete sets of playing cards (32 cards) we pulled out one card. What is the probability of pulling the ace?
How many different flags can be made from colors purple, yellow, red, white, blue, green, orange so that each flag consisted of three different colors?
In how many ways can 7 shuttle vans line up at the airport?
How many ways can 9 people sit on 3 numbered chairs (eg seat reservation on the train)?
Pediatrician this month of 21 working days takes 3 days holidays. What is the probability that on Monday will be at work?
How many ways can 5 guests sit down on 6 seats standing in a row?
- Bureau of Labor
Bureau of Labor is a state institution that provides mike and the rest for their so-called clients. The mission of the Bureau of Labor is spend taxpayer money to provide relaxation and benefits to those who do not want to work. Popularly speaking sense the
- 2nd class variations
From how many elements you can create 6972 variations of the second class?
What is the probability that a random word composed of chars T, H, A, M will be MATH?
How many ways are there to arrange 6 books on a shelf?
In the market have 4 kinds of chocolates. How many ways can we buy 19 chocolates?
- Phone numbers
How many 9-digit telephone numbers can be compiled from the digits 0,1,2,..,8,9 that no digit is repeated?
Would you like to compute count of combinations?