A) \[9(10\ !)\]
B) \[2(10\ !)\]
C) \[45(8\ !)\]
D) \[10\ !\]
Correct Answer: A
Solution :
12 persons can be seated around a round table in \[11\ !\] ways. The total number of ways in which 2 particular persons sit side by side is\[10\ !\ \times \ 2\ !\]. Hence the required number of arrangements\[=11\ !\ -10\ !\ \times 2\ !\ =9\times 10\ !\].
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