14 persons are seated around a circular table. Find the probability that 3 particular persons always seated together.

A 11/379

B 21/628

C 24/625

D 26/247

Solution

Correct Answer: Option C

Total no of ways = (14 – 1)! = 13!

Number of favorable ways = (12 – 1)! = 11!

 

So, required probability = \(\left(\frac{\left(\mathbf{11}\boldsymbol!\boldsymbol\times\mathbf3\boldsymbol!\right)}{\mathbf{13}\boldsymbol!}\right)\)

                                  = \(\frac{39916800\times6}{6227020800}\)

                                  = \(\frac{\mathbf{24}}{\mathbf{625}}\)

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