How many permutations of 2 item can be selected from a group of 4? ?

B) Use the letters A, B, C D to identify the items & list each possibility. 

c) If random sampling is employed what is the probability that any particular sample will be selected

1 Answer

  • 4 months ago

    (4!)/(2!) = 12

    B)  { AB, AC, AD, BA, BC, BD, CA, CB, CD, DA, DB, DC }

    C) A random sampling of what?  What is a "particular sample?"  If you mean a random sampling of the four items, the probability of any one particular item being selected is 25%.  OTOH, if you mean the probability of any one particular possibility from part B, then 8.(3)%

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