In a restaurant, 19 men and 9 women are seated on 28 chairs at a round table. Find the total number of possible ways such that 19 men are always sitting next to each other.10! x 19!9! x 19!8! x 18!27!
Question
In a restaurant, 19 men and 9 women are seated on 28 chairs at a round table. Find the total number of possible ways such that 19 men are always sitting next to each other.10! x 19!9! x 19!8! x 18!27!
Solution
The problem is asking for the number of ways 19 men and 9 women can be seated at a round table with the condition that all 19 men must always be seated next to each other.
Step 1: Consider all 19 men as a single entity. Now, we have 10 entities to arrange (1 group of men and 9 women).
Step 2: As the table is round, the number of arrangements for these 10 entities is (10-1)! = 9!. This is because in a circular arrangement, we consider one point as a reference and arrange the others in relation to it, hence n-1.
Step 3: Within the group of 19 men, they can be arranged amongst themselves in 19! ways.
Step 4: Multiply the number of arrangements of the 10 entities and the arrangements of the men within their group to get the total number of arrangements.
So, the total number of ways is 9! * 19!.
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