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Permutations, combinations and probability

Class 11 · Mathematics · 5 questions

Name: ____________________   Date: ____________

  1. What is 5 factorial?

    • A 60
    • B 120
    • C 720
    • D 25

  2. How many ways can 3 books be arranged on a shelf?

    • A 3
    • B 12
    • C 6
    • D 9

  3. What is 5C2?

    • A 10
    • B 5
    • C 25
    • D 20

  4. A die is thrown once. The probability of an even number is:

    • A 1/3
    • B 2/3
    • C 1/2
    • D 1/6

  5. The number of arrangements of the letters of the word MOON is:

    • A 12
    • B 6
    • C 24
    • D 4

Answer key

1. B, 2. C, 3. A, 4. C, 5. A

  1. 5! = 120.

  2. 3! = 6.

  3. 5! / (2! 3!) = 10.

  4. Three of the six faces are even.

  5. 4! / 2! = 12 because O repeats twice.