Combinatorial number - examples - page 4

  1. Combinations
    trezor_1 How many elements can form six times more combinations fourth class than combination of the second class?
  2. Dice
    dices2_4 We throw five times the dice. What is the probability that six fits exactly twice?
  3. Raffle
    tombola_3 There are 200 draws in the raffle, but only 20 of them win. What is the probability of at least 4 winnings for a group of people who have bought 5 tickets together?
  4. Test
    test_4 The teacher prepared a test with ten questions. The student has the option to choose one correct answer from the four (A, B, C, D). The student did not get a written exam at all. What is the probability that: a) He answers half correctly. b) He answers.
  5. Subsets
    venn5 How many 19 element's subsets can be made from the 26 element set?
  6. Combinations 6
    dices2_3 6 purses 9 flaps 12 straps Every combination must include 1 purse, 1 flap and 1 strap. How many possible combinations?
  7. Find the 2
    square_4 Find the term independent of x in the expansion of (4x3+1/2x)8

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