Permutation and Combination Questions Practice Question and Answer

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Q:

Everybody in a room shakes hands with everybody else. The total number of hand-shakes is 55. The total number of persons in the room is:

 1485 0

  • 1
    11
    Correct
    Wrong
  • 2
    12
    Correct
    Wrong
  • 3
    8
    Correct
    Wrong
  • 4
    14
    Correct
    Wrong
  • 5
    None of these
    Correct
    Wrong
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Answer : 1. "11"

Q:

In how many different ways can the letters of the word ‘STRESS’ be arranged?

 1236 0

  • 1
    360
    Correct
    Wrong
  • 2
    240
    Correct
    Wrong
  • 3
    720
    Correct
    Wrong
  • 4
    120
    Correct
    Wrong
  • 5
    None of these
    Correct
    Wrong
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Answer : 4. "120"

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