Seven persons are to be seated in a row. The probability that two particular persons sit next to each other is
Seven persons are to be seated in a row. The probability that two particular persons sit next to each other is
1). $\frac{1}{3}$
2). $\frac{1}{6}$
3). $\frac{2}{7}$
4). $\frac{1}{2}$
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