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A round table conference is to be held a...

A round table conference is to be held among 20 delegates of 20 countries. The number of ways they can seated, if two particular delegates are never sit together is

A

1)`17 xx 1 8 !`

B

2)`18 xx 19 !`

C

3)`(20 !)/(2)`

D

4)`19 ! xx 2`

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The correct Answer is:
D
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