Amy, Ben, Canny, Debby, Emily, Vicky six people stand side by side in a row. If Ben and Debby must be adjacent, how many different arrangements are there?
Added by Lawrence E.
Step 1
We can consider Ben and Debby as a single unit, since they must be adjacent. So we have 5 units to arrange: Amy, Canny, Emily, Vicky, and the unit of Ben and Debby. Show more…
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