# Combinatorics

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

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

**Showing 0 comments:**

**Be the first to comment!**

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

## Next similar examples:

- Blocks

There are 9 interactive basic building blocks of an organization. How many two-blocks combinations are there? - Division

Division has 18 members: 10 girls and 6 boys, 2 leaders. How many different patrols can be created, if one patrol is 2 boys, 3 girls and 1 leader? - Chords

How many 4-tones chords (chord = at the same time sounding different tones) is possible to play within 7 tones? - Examination

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

How many ways can divide 16 players into two teams of 8 member? - The confectionery

The confectionery sold 5 kinds of ice cream. In how many ways can I buy 3 kinds if order of ice creams does not matter? - Medals

In how many ways can be divided gold, silver and bronze medal among 21 contestant? - 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? - Disco

On the disco goes 12 boys and 15 girls. In how many ways can we select four dancing couples? - Trinity

How many different triads can be selected from the group 43 students? - A student

A student is to answer 8 out of 10 questions on the exam. a) find the number n of ways the student can choose 8 out of 10 questions b) find n if the student must answer the first three questions c) How many if he must answer at least 4 of the first 5 que - PIN - codes

How many five-digit PIN - code can we create using the even numbers? - Weekly service

In the class are 20 pupils. How many opportunities have the teacher if he wants choose two pupils randomly who will weeklies? - Olympics metals

In how many ways can be win six athletes medal positions in the Olympics? Metal color matters. - Variations

Determine the number of items when the count of variations of fourth class without repeating is 42 times larger than the count of variations of third class without repetition. - Theorem prove

We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?