Combinatorics - practice for 9 year olds
Number of problems found: 12
- A single
A single, standard number cube is tossed. What is the probability of getting a number greater than 3? - Football team
The football team has black, purple, and orange shirts, blue and white shorts, and striped and gray socks. How many different outfits may players start? - Marbles 3
Paisley has a bag of 16 green, orange, and yellow marbles. If there are eight green marbles, how many marbles have to be yellow for P(yellow) = 1/4? - Individual 5544
From 5 girls and four boys have to choose one pair, boy and girl. List all the pairs in which the individual boys will be. Attention, these are four examples. How many pairs are there? - Green and red cubes
There are five green cubes (numbered 1 - 5) and four red cubes (numbered 1 - 4). How many ways can the cubes fit in a box that only needs two green and three red cubes? - Page numbering
The book has 88 pages. How many times is the number 4 used for the book numbering? - Simultaneously 80392
Dulikovci, Elikovci, Filikovci, and Galikovci visited each other often last month. Each family visited each family exactly once. How many visits did all four families make together? If two families came to visit one family simultaneously, count it twice. - Different 82982
How many different ways can Milka, Peter, Joseph, and Renata sit next to each other in the cinema if Milka always sits in seat number 1 and Peter always sits in seat number 4? List all options. - Individual 4688
The locomotive pulls six wagons. Each of the wagons is either red or blue. The order of colors of individual wagons is the same from the front and back. How many such trains can you draw? - 52 cards
A hand of five cards is dealt from a pack of 52 playing cards. How many different hands can be dealt that contain three aces? - Triangle from sticks
Bob the boulder has many sticks of lengths 3.5 and 7. He wants to form triangles, each of whose edges consists of exactly one stick. How many non-congruent triangles can be formed with the sticks? - Positive integer integral
How many different sets of a positive integer in the form (x, y, z) satisfy the equation xyz=1400?
We apologize, but in this category are not a lot of examples.
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