Q. If eleven member of a committee sit at a round table so that the President and Secretary always sit together, then the number of arrangements is
A) $10! \times 2$
B) $10!$
C) $9! \times 2$
D) None of these
Explanation
(c)
Since, out of eleven members two numbers sit together, then the number of arrangements$= 9! \times 2$
($\because$ Two numbers can be sit in two ways)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.