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A round table conference is to be held amongst 20 countries. If two particular delegates wish to sit together, then such arrangements can be done in ways.
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Verified Answer
The correct answer is:
$2 \times(18) !$
We consider two particular delegates as single unit now 19 units can be arranged around a round table in 18! ways and the two delegates can be arranged mutually in 2 ! ways
Hence the required number of ways is $2 \times(18$ !)
Hence the required number of ways is $2 \times(18$ !)
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