# Combinatorial number - examples

See also our combinations calculator.- Test

The teacher prepared a test with ten questions. The student has the option to choose one correct answer from the four (A, B, C, D). The student did not get a written exam at all. What is the probability that: a) He answers half correctly. b) He answers. - Word

What is the probability that a random word composed of chars M, R, P, E, I, O, G, S, S, G, R, T, E, C, E, N, I, O, O, R will be GEOMETRICPROGRESSION? - Chocolates

In the market have 3 kinds of chocolates. How many ways can we buy 13 chocolates? - Rectangles

How many rectangles with area 2832 cm^{2}whose sides is natural numbers are? - Sales

From statistics of sales goods, item A buy 54% of people and item B buys 58% of people. What is the probability that from 3 people buy 2 item A and 1 item B? - Stacks

Annie has a total of $ 969. The money must be divided into stacks so that each buyer has the same amounth of dollars. How many options she have? - Candy

How many ways can divide 22 identical candies to 4 children? - N-gon

How many diagonals has convex 29-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? - Party

At party overyone clink with everyone. Together, they clink 406 times. How many people were at the party? - 2nd class combinations

From how many elements you can create 1081 combinations of the second class? - Lines

In how many points will intersect 11 different lines, where no two are parallel? - Commitee

A class consists of 12 males and 19 females. How many committees of 4 are possible if the committee must consist of 2 males and 2 females? - Family

What is the probability that a family with 7 childrens have: exactly 0 girls? 1 girl and 6 boys? Consider the birth probability of a girl is 48.73% and boy 51.27%. - Bulbs

The probability that the bulb can operate 4000 hours is 0.13. What is the probability that exactly one of eight bulbs can operate 4000 hours? - Examination

The class is 22 students. How many ways can choose four 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 - Tournament

Determine how many ways can be chosen four representatives from 27 students to school tournament. - The camp

At the end of the camp a 9 friends exchanged addresses. Any friend gave remaining 8 friends his card. How many addresses they exchanged? - Circles

How many different circles is determined by 12 points at the plane, if 7 of them lie in a straight line?

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