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Question
Twenty people sit around at random at a round table. Find the probability that two people A,B sit with four people between them.
Twenty people sit around at random at a round table. Find the probability that two people A,B sit with four people between them.
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Solution
The correct option is A 219.
Suppose we fix any seat for A then B can sit in any other seats,
so total ways =19.
Now favorable cases =2, as B can sit on the left or on the right
of A with four persons between them.
Hence required probability=219.
Suppose we fix any seat for A then B can sit in any other seats,
so total ways =19.
Now favorable cases =2, as B can sit on the left or on the right
of A with four persons between them.
Hence required probability=219.
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