# 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

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- The GnosticLv 74 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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