Combinatorics - math word problems
From the bag with numbered balls (numbers 1,2,3,. ..20) we pick one ball. What is the probability of choosing a number containing 1?
- Graduation party
There are 15 boys and 12 girls at the graduation party. Determine how many four couples can be selected.
Records indicate 90% error-free. If 8 records are randomly selected, what is the probability that at least 2 records have no errors?
- Genetic disease
One genetic disease was tested positive in both parents of one family. It has been known that any child in this family has a 25% risk of inheriting the disease. A family has 3 children. What is the probability of this family having one child who inherited.
- Dice and coin
A number cube is rolled and a coin is tossed. The number cube and the coin are fair. What is the probability that the number rolled is greater than 2 and the coin toss is head?
In rectangle with sides, 6 and 3 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?
- No. of divisors
How many different divisors has number ??
- 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 white, red, green, purple, orange, yellow, blue so that each flag consisted of three different colors?
In how many ways can 9 shuttle vans line up at the airport?
How many ways can 5 people sit on 4 numbered chairs (e. G. , seat reservation on the train)?
Pediatrician this month of 20 working days takes 4 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
What is the probability that a random word composed of chars E, Y, G, E, R, O, M, T will be the GEOMETRY?
- 2nd class variations
From how many elements you can create 2450 variations of the second class?
How many ways are there to arrange 6 books on a shelf?
3 trees in 3 lines grows in the orchard. How many trees are in the orchard?
In the market have 3 kinds of chocolates. How many ways can we buy 14 chocolates?
Would you like to compute count of combinations?