At the end of the camp a 8 friends exchanged addresses. Any friend gave remaining 7 friends his card. How many addresses they exchanged?
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:
On the disco goes 12 boys and 15 girls. In how many ways can we select four dancing couples?
How many different triads can be selected from the group 38 students?
From the colors - red, blue, green, black and white, create all possible tricolors.
- Class pairs
In a class of 34 students, including 14 boys and 20 girls. How many couples (heterosexual, boy-girl) we can create? By what formula?
- 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?
The class is 21 students. How many ways can choose two to examination?
In how many ways can be divided gold, silver and bronze medal among 21 contestant?
- Olympics metals
In how many ways can be win six athletes medal positions in the Olympics? Metal color matters.
Hockey match ended 8:2. How many different matches could be?
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?
The city has 7 fountains. Works only 6. How many options are there that can squirt ?
- First class
The shipment contains 40 items. 36 are first grade, 4 are defective. How many ways can select 5 items, so that it is no more than one defective?
The village markets have 5 kinds of sweets, one weighs 31 grams. How many different ways a customer can buy 1.519 kg sweets.
In the Hockey World Cup play eight teams, determine how many ways can they win gold, silver and bronze medals.
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?
- Cars plates
How many different licence plates can country have, given that they use 3 letters followed by 3 digits?
- Task of the year
Determine the number of integers from 1 to 106 with ending four digits 2006.