Combinatorial number - practice for 14 year olds - page 4 of 5
Number of problems found: 82
- Probability 2955
There are 18 girls and 13 boys in the class. Four pupils will be chosen by lot to supervise the breaks. What is the probability that it will be the boys themselves? - Combinations of sweaters
I have four sweaters, two are white, one red and one green. How many ways can you sort it out? - Volleyball
Eight girls want to play volleyball against boys. On the field at one time can be six players per team. How many initial teams of these girls may be trainers to choose from? - Class pairs
In a class of 34 students, including 14 boys and 20 girls. How many couples (heterosexual, boy-girl) can we create? By what formula?
- Hockey game
In the hockey game, they made six goals. The Czech played against Finland. The Czechs won 4:2. In what order to fall goals? How many game sequences were possible during the game? - Three-digit numbers
How many three-digit numbers are from the numbers 0 2 4 6 8 (with/without repetition)? - The confectionery
The confectionery sold five kinds of ice cream. How many ways can I buy three kinds if the order of ice cream does not matter? - Balls
The urn is eight white and six black balls. We pull four random balls. What is the probability that among them will be two white? - The camp
At the end of the camp, a 8 friends exchanged addresses. Any friend gave their remaining 7 friends their card. How many addresses did they exchange?
- Pairs
Teachers must choose one pair of boys and girls from the five girls and four boys. A) How many such pairs of (M + F)? B) How many pairs were only boys (M + M)? C) How many are all possible pairs? - Combinatorics
The city has 7 fountains. Works only 6. How many options are there that can squirt? - Weekly service
In the class are 20 pupils. How many opportunities has the teacher selected for two pupils who will have a week-class service randomly? - MATES
In MATES (Small Television tipping), from 35 random numbers are drawn five winning numbers. How many possible combinations are there? - Count of triangles
On each side of an ABCD square is 10 internal points. Determine the number of triangles with vertices at these points.
- Lines
How many points will intersect 14 different lines where no two are parallel? - Rectangles
How many rectangles with area 3152 cm² whose sides are natural numbers? - Examination
The class is 25 students. How many ways can we choose 5 students for examination? - Teams
How many ways can we divide 16 players into two teams of 8 members? - Tournament
Determine how many ways can be chosen two representatives from 34 students to school tournament.
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See also our combinations calculator. Combinatorial number - practice problems. Maths practice for 14 year olds.