Combinatorial number - practice problems
Number of problems found: 239
- Bernoulli trial
A used car sales woman estimates that each times she shows a customer a car, there is a probability of 0.1 that the customer will buy the car. The sales woman would like to sell at least one car per week. If showing a car is a Bernoulli trial with a proba
- A committee
A committee of 6 is chosen from 8 men and 7 women. Find how many committees are possible if a particular man must be included.
- Probability 73714
I roll six six-sided dice; what is the probability that exactly three threes will fall?
- A bag 2
A bag contains 7 green and 8 red jellybeans. How many ways can 5 jellybeans be withdrawn from the bag so that the number of green ones withdrawn will be less than 4?
- Probability 73054
We roll six dice. What is the probability that: a) a six falls twice b) six falls four times
- Between 72924
How many ways do we know to select three cards from a deck of seven cards so that there are two red and one green between them?
- Five identical
Five identical coins are tossed. What is the probability for more than 1 head?
- Combinations 70714
If we increase the number of elements by 1, the number of combinations of the third class without repetitions increases by 10. How many elements do we have?
- Including 70264
A group of six, including at least three women, is selected from seven men and four women. Find how many ways we can do this.
- Five-a-side 69434
Five children took part in the five-a-side tournament: Anka, Betka, Celeste, Dano, and Erik. Everyone played with everyone. How many games have been played?
- Three-member 69274
The teacher wants to create one three-member team of four girls and four boys, in which there will be one girl and two boys. How many different options does it have to create a team?
- Arbitrary 69194
There are ten arbitrary points in the plane. How many circles can we make from them?
- Different 68754
We have six balls of different colors. We select two balls at once. How many options?
- Probability 68584
There are five whites and nine blacks in the destiny. We will choose three balls at random. What is the probability that a) the selected balls will not be the same color, b) will there be at least two blacks between them?
- Different 68064
Anička painted eggs for art. She had five colors for her eggs. He wants to put three of them on each. How many different colored eggs could she paint? (It's just the colors, not the shapes on them. )
- Raspberries 66824
Klára wants to make a fruit cocktail from three types of fruit. It has pineapple, pears, bananas, raspberries, and cherries. How many different cocktails can he create?
- Designated 66594
Marenka is required to read three books out of five designated books. How many ways can three books choose to be read?
- (2 66504
K (2, 8) + K (3, 4) =
- 6 married
6 married couples are in a room, if 2 people are chosen at random. Find the probability that; a). they are married. b). one is male and one is female.
- Different 65654
Jane received three different marks (1-5) during the day. How many marks did she receive? A) 6 B) 8 C) 10 D) 12
See also our combinations calculator.