First slide

Permutations

Question

If eleven members of a committee sit at a round table so that the President and Secretary always sit together, then the number of arrangements is

Easy

A

10! x 2
B

10!
C

9! x 2
D

None of these

Solution

Since, out of eleven members two members sit together,
then the number of arrangements = 9 ! x 2
[ two numbers can be sit in two ways]

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