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antoxavier
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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I used a different approach..
total number of possible arrangements: 11!/5!4!2! = 6930.
only 1155 is a multiple of 6930.

A.
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Given: Eleven books consisting of 5 financial management, 4 marketing management and 2 system management are placed on a shelf at random order.
Asked: What is the probability that the books of each kind are all together.

Total number of ways to arrange all books = (5+4+2)! = 11!
Favorable ways = 5! 4! 2! 3!

The probability that the books of each kind are all together = 5! 4! 2! 3! / 11! = 1/1155

IMO A
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