# Combinatorial number - math word problems

- Graduation party

There are 15 boys and 12 girls at the graduation party. Determine how many four couples can be selected. - Records

Records indicate 90% error-free. If 8 records are randomly selected, what is the probability that at least 2 records have no errors? - Genetic disease

One genetic disease was tested positive in both parents of one family. It has been known that any child in this family has a 25% risk of inheriting the disease. A family has 3 children. What is the probability of this family having one child who inherited. - Word

What is the probability that a random word composed of chars E, Y, G, E, R, O, M, T will be the GEOMETRY? - Chocolates

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

How many rectangles with area 3032 cm^{2}whose sides is natural numbers are? - Candy

How many ways can divide 10 identical candies to 5 children? - 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? - Stacks

Annie has a total of $ 702. The money must be divided into stacks so that each buyer has the same amounth of dollars. How many options she have? - 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 the party everyone clink with everyone. Together, they clink 406 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?

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