Arithmetic Ability
Permutations and Combinations

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Q.

The number of ways that 7 teachers and 6 students can sit around a table so that no two students are together is 

View Answer

Correct choice: B

Explanation:

The students should sit in between two teachers. There are 7 gaps in between teachers when they sit in a roundtable. This can be done in 7P6 ways. 7 teachers can sit in (7-1)! ways. Required no.of ways is = 7P6.6! = 7!.6!
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