Combinatorial number - examples
There are 9 interactive basic building blocks of an organization. How many two-blocks combinations are there?
What x-gon has 54 diagonals?
- Three students
Three students independently try to solve the problem. The first student will solve a similar problem with a probability of 0.6, the second student will solve at a probability of 0.55, and the third will solve at a probability 0.04. The problem is resolved
We throw 10 times a play dice, what is the probability that the six will fall exactly 4 times?
- Bridge cards
How many bridge hands are possible containing 4 spades,6 diamonds, 1 club, and 2 hearts?
- Cancel fractions
Compress the expression of factorial: (n+6)!/(n+4)!-n!/(n-2)!
What is the probability that a random word composed of chars H, T, M, A will be MATH?
In the market have 4 kinds of chocolates. How many ways can we buy 23 chocolates?
How many rectangles with area 3002 cm2 whose sides is natural numbers are?
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?
How many ways can divide 16 identical candies to 4 children?
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?
How many diagonals has convex 14-gon?
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?
At party overyone clink with everyone. Together, they clink 171 times. How many people were at the party?
- 2nd class combinations
From how many elements you can create 4560 combinations of the second class?
In how many points will intersect 14 different lines, where no two are parallel?
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?
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%.
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?
See also our combinations calculator.