# High school + combinatorial number - examples

- Menu

On the menu are 12 kinds of meal. How many ways can we choose four different meals into the daily menu? - Word

What is the probability that a random word composed of chars T, H, A, M will be MATH? - Chocolates

In the market have 4 kinds of chocolates. How many ways can we buy 19 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? - N-gon

How many diagonals has convex 11-gon? - Pairs

From the five girls and four boys teachers have to choose one pair of boy and girl. A) How many such pairs of (M + F)? B) How many pairs where only boys (M + M)? C) How many are all possible pairs? - 2nd class combinations

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

At party overyone clink with everyone. Together, they clink 171 times. How many people were at the party? - Lines

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

What is the probability that a family with 7 childrens have: exactly 5 girls? 7 girls and 0 boys? Consider the birth probability of a girl is 48.69% and boy 51.31%. - Bulbs

The probability that the bulb can operate 5000 hours is 0.16. What is the probability that exactly one of three bulbs can operate 5000 hours? - Examination

The class is 21 students. How many ways can choose two to examination? - Math logic

There are 20 children in the group, each two children have a different name. Alena and John are among them. How many ways can we choose 8 children to be among the selected A) was John B) was John and Alena C) at least one was Alena, John D) maximum one w - Cinema

How many ways can be divided 11 free tickets to the premiere of "Jáchyme throw it in the machine" between 6 pensioners? - Tournament

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

At the end of the camp a 8 friends exchanged addresses. Any friend gave remaining 7 friends his card. How many addresses they exchanged? - Circles

How many different circles is determined by 9 points at the plane, if 6 of them lie in a straight line? - Three-digit numbers

How many three-digit numbers are from the numbers 0 2 4 6 8 (with/without repetition)? - Combinatorics

The city has 7 fountains. Works only 6. How many options are there that can squirt ?

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