7. Find the number of ways in which 5 people A, B, C, D, and E can be seated at a round table, such that a. A and B must always sit together. b. C and D must not sit together
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Since they must always sit together, we can treat them as a single entity. So, we have AB, C, D, and E. Now, let's consider the seating arrangement for AB, C, D, and E. Since C and D must not sit together, we need to find the number of ways to arrange them such Show more…
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