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Q.

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

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a

10! x 2

b

10!

c

9! x 2

d

None of these

answer is C.

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Detailed 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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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