# Balls

The urn is 8 white and 6 black balls. We pull 4 randomly balls. What is the probability that among them will be two white?

Result

p =  0.42

#### Solution:

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Be the first to comment!

#### To solve this example are needed these knowledge from mathematics:

Would you like to compute count of combinations?

## Next similar examples:

1. One green
In the container are 45 white and 15 balls. We randomly select 5 balls. What is the probability that it will be a maximum one green?
2. Weekly service
In the class are 20 pupils. How many opportunities have the teacher if he wants choose two pupils randomly who will weeklies?
3. Today in school
There are 9 girls and 11 boys in the class today. What is the probability that Suzan will go to the board today?
4. Cards
The player gets 8 cards of 32. What is the probability that it gets a) all 4 aces b) at least 1 ace
5. Probability
What are the chances that the lottery, in which the numbers are drawn 5 of 50 you win the first prize?
6. Theorem prove
We want to prove the sentence: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
7. Candies
In the box are 12 candies that look the same. Three of them are filled with nougat, five by nuts, four by cream. At least how many candies must Ivan choose to satisfy itself that the selection of two with the same filling? ?
8. A book
A book contains 524 pages. If it is known that a person will select any one page between the pages numbered 125 and 384, find the probability of choosing the page numbered 252 or 253.
9. Examination
The class is 21 students. How many ways can choose two to examination?
10. Trinity
How many different triads can be selected from the group 43 students?
11. Blocks
There are 9 interactive basic building blocks of an organization. How many two-blocks combinations are there?
12. Calculation of CN
Calculate: ?
13. Fish tank
A fish tank at a pet store has 8 zebra fish. In how many different ways can George choose 2 zebra fish to buy?
14. Chords
How many 4-tones chords (chord = at the same time sounding different tones) is possible to play within 7 tones?
15. Teams
How many ways can divide 16 players into two teams of 8 member?
16. 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.
17. Volleyball
8 girls wants to play volleyball against boys. On the field at one time can be six players per team. How many initial teams of this girls may trainer to choose?