Question

If 12 persons are seated at round table, what is the probability that two particular persons sit together?

Answer 1

Answer:

3/55

Step-by-step explanation:

Total probability=(12−1)!=11!

Desired probability=(10−1)!=9!

P=9! x 3!/11!

  = 9! x 3!/11 x 10 x 9!

   =3 x 2 x 1/11 x 10

   = 3/55