Combination Question
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Hi, This is T.Murat from Bangkok.
First, we should assume D & E as one person; call it K.
Then, we have A, B, C, and K to be seated in a row. That will be in 4! ways, 24 ways.
Lastly, focus back on D & E, they can seat in 2 different ways; DE or ED, in all of these 24 ways.
That adds up to 24 x 2 = 48 different arrangements.
All the best.
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