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From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. The number of such arrangements is :

1. at least 1000
2. less than 500
3. at least 500 but less than 750
4. at least 750 but less than 1000 Students may find similar question in CP exercise sheet : [ JEE Main, Chapter : P & C, Ex. 4, Q. No. 14 ]

Correct answer: at least 1000

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