SOLUTION: List all the permutations of the 4 objects a, b, c, and d, taken 2 at a time.

Question 1191405: List all the permutations of the 4 objects a, b, c, and d, taken 2 at a time.
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

I don't know what it is about this that you need help with....

The first letter can be any of the four given letters; for each first letter, the second letter can be any of the three remaining letters.

To make sure you get all the permutations, keep them in alphabetical order.

      b  -->  ab
    /
  a - c  -->  ac
    \
      d  -->  ad

      a  -->  ba
    /
  b - c  -->  bc
    \
      d  -->  bd

      a  -->  ca
    /
  c - b  -->  cb
    \
      d  -->  cd

      a  -->  da
    /
  d - b  -->  db
    \
      c  -->  dc

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