Combinatorial number - practice for 13 year olds
Number of problems found: 32
- Students 62184
There are 16 students in the class. If the teacher wants to choose two students who will be weekly, how many options does she have? - Draw a triangle
We have line segments with lengths of 3cm, 5cm, 6cm, 7cm, and 9cm. What is the probability in % that if I randomly select three of them, I will be able to draw a triangle? - Different 42191
How many different triangles with vertices formed by points A, B, C, D, E, and F can we create? - Two-element combinations
Write all two-element combinations from elements a, b, c, and d.
- Competition 33041
The long-term volleyball tournament is played on a one-on-one basis. So far, 11 teams have entered the competition. How many matches will be lost when two teams unsubscribe? - Ten persons
Ten persons, each person, make a hand to each person. How many hands were given? - Punishment 26851
Alena, Ivana, Edo, Filip, and Martin came late to school. As a punishment, two will water flowers all over the school after class, and the other three will clean up the classroom. The class teacher couldn't decide who to send to water the flowers, so Juro - Pairs of socks
Ferdinand has twelve pairs of socks, and one sock is leaky. What is the probability of putting on a leaky sock? - Probability 8408
From the group of 18 players I am, the coach selects nine players. What is the probability that I will be among the players chosen?
- Three numbers
We have three different non-zero digits. We will create all three digits numbers from them to use all three figures in each. We add all the made numbers and get the sum of 1554. What were the numbers? - Different 7860
How many different triplets can be created from 4 pupils if it does not matter the order of the pupils in the triplets? - Numbers 7755
How many digits 7 are in numbers from 1 to 777? - Sweater
Dana confuses me that sweaters and wool have a choice of seven colors. In how many ways can she choose from three colors for the sleeves? - Triangles
Five sticks with a length of 2,3,4,5,6 cm. How many ways can you choose three sticks to form three sides of a triangle?
- Subsets
How many 19 element subsets can be made from the 26 element set? - Lines
How many lines can be drawn with 8 points if three points lie on one line and the other any three points do not lie on the same line? - Intersect 5216
At how many points do ten lines intersect if no two are parallel? - Possibilities 5058
Adamko is two years old and does not want to clean his toys. One night, the toy fairy came to his room and saw legos, a police car, blocks, and a train lying on the floor. The fairy decided to take 3 toys from Adamko. How many choices does a trio of toys - Roses 2
Aunt Rose went to the flower shop to buy three rose bouquets. The flower shop had white, yellow, and red roses. How many different flowers bouquets can a flower make for Aunt Rose create? Write all the bouquet options.
Do you have homework that you need help solving? Ask a question, and we will try to solve it.