Question
Write all permutations of the letters $ A $, $ B $, $ C $, and $ D $ if the letters $ B $ and $ C $ must remain between the letters $ A $ and $ D $.
Step 1
This means that A and D will always be at the ends of the permutation, and B and C will always be in the middle. Show more…
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Write all permutations of the letters $ A $, $ B $, $ C $, and $ D $.
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Use the letters $\mathbf{A}, \mathbf{B}, \mathbf{C},$ and $\mathbf{D}$. Write all permutations of the letters when the letters $\mathrm{B}$ and $\mathrm{C}$ must remain between the letters $\mathrm{A}$ and $\mathrm{D}$.
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