<p>Please explain BB Pg 584 # 11</p>
<p>Help would be appreciated</p>
<p>you have two options for changing the sequence:
1. change two adjacent letters
2. reverse the entire sequence
and you have to put the letters in alphabetical order.</p>
<p>so, start with the original: ZWYX
change #1: reverse the sequence: XYWZ
change #2: reverse Y and W: XWYZ
change #3: reverse X and W: WXYZ
now it's in alphabetical order. So the lease number of changes you need is 3, which is answer choice (B)</p>