# Combinatorial number - high school - practice problems

#### Number of problems found: 138

- Commitee

A class consists of 6 males and 7 females. How many committees of 7 are possible if the committee must consist of 2 males and 5 females? - Count of triangles

Given a square ABCD and on each side 10 internal points. Determine the number of triangles with vertices at these points. - Chocolates

In the market we have 3 kinds of chocolates. How many ways can we buy 14 chocolates? - Sales

From statistics of sales goods, item A buy 51% of people and item B buys 59% of people. What is the probability that from 10 people buy 2 item A and 8 item B? - Lines

In how many points will intersect 14 different lines, where no two are parallel? - Hockey

The hockey match ended 8:2. How many different matches could be? - Calculation of CN

Calculate: (789 choose 786) - (789 choose 3) - Word

What is the probability that a random word composed of chars S, G, R, S, E, I, N, A, L, P, C, T, M, H, E, E will be the SPHERICALSEGMENT? - Bulbs

The probability that the bulb can operate 4000 hours is 0.3. What is the probability that exactly one of eight bulbs can operate 4000 hours? - Examination

The class is 25 students. How many ways can choose 5 students to examination? - Teams

How many ways can divide 16 players into two teams of 8 member? - Tournament

Determine how many ways can be chosen two representatives from 34 students to school tournament. - Chords

How many 4-tones chords (chord = at the same time sounding different tones) is possible to play within 7 tones? - Confectionery

The village markets have 5 kinds of sweets, one weighs 31 grams. How many different ways a customer can buy 1.519 kg sweets. - 2nd class combinations

From how many elements you can create 4560 combinations of the second class? - Party

At the party everyone clink with everyone. Together, they clink 406 times. How many people were at the party? - N-gon

How many diagonals have convex 11-gon? - Family

What is the probability that a family with 7 childrens have: exactly 6 dívek? 2 dívky and 5 boys? Consider the birth probability of a girl is 48.87% and boy 51.13%.

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See also our combinations calculator. Combinatorial number - practice problems. Examples for secondary school students.