Arithmetic Ability
Permutations and Combinations

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Q.

In how many ways can an animal trainer arrange 5 lions and 4 tigers in a row so that no two lions are together?

View Answer

Correct choice: B

Explanation:

They have to be arranged in the following way : L T L T L T L T L The 5 lions should be arranged in the 5 places marked ‘L’. This can be done in 5! ways. The 4 tigers should be in the 4 places marked ‘T’. This can be done in 4! ways. Therefore, the lions and the tigers can be arranged in 5!´ 4! ways = 2880 ways.
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