Multiplication principle - examples

  1. Math logic
    children_7 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
  2. First class
    prvni_jakost 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?
  3. Cards
    cards_8 From a set of 32 cards we randomly pull out three cards. What is the probability that it will be seven king and ace?
  4. Salami
    salama How many ways can we choose 5 pcs of salami, if we have 6 types of salami for 10 pieces and one type for 4 pieces?
  5. 7 heroes
    7statocnych 5 heroes galloping on 5 horses behind. How many ways can sort them behind?
  6. Vans
    shuttlevan In how many ways can 7 shuttle vans line up at the airport?
  7. Flags
    vlajka_cz How many different flags can be made from colors red, white, blue, black, yellow, green, purple, gray, orange so that each flag consisted of three different colors?
  8. Seating
    kupe_1 How many ways can 7 people sit on 3 numbered chairs (eg seat reservation on the train)?
  9. Football league
    football In the 2nd football league is 19 teams. How many ways can be filled first, second and third place?
  10. Guests
    hostia How many ways can 7 guests sit down on 9 seats standing in a row?
  11. Playing cards
    playing_cards How many possible ways are to shuffle 7 playing cards?
  12. Shelf
    bookshelf.JPG How many ways are there to arrange 9 books on a shelf?
  13. Medals
    medails In how many ways can be divided gold, silver and bronze medal among 18 contestant?
  14. Coin and die
    die Flip a coin and then roll a six-sided die. How many possible combinations are there?
  15. Word
    words What is the probability that a random word composed of chars T, I, O, D, I will be IDIOT?
  16. Numbers
    numbers_3 How many different 4 digit natural numbers in which no digit is repeated, can be composed from digits 0,1,2,3?
  17. Weekly service
    school_table.JPG In the class are 16 pupils. How many opportunities have the teacher if he wants choose two pupils randomly who will weeklies?
  18. Area codes
    us_codes How many 6 digit area codes are possible if the first number can't be zero?
  19. 2nd class variations
    cards From how many elements you can create 6480 variations of the second class?
  20. Balls
    spheres From the urn in which are 18 white balls and 4 red, gradually drag 5-times without replacement. What is the probability that pulls balls are in order: red red white white white?

Do you have interesting mathematical example that you can't solve it? Enter it and we can try to solve it.



To this e-mail address we will reply solution; solved examples are also published here. Please enter e-mail correctly and check whether you don't have a full mailbox.