From 6 different novels and 3 different ...

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

less than 500

atleast 500 but less than 750

atleast 750 but less than 1000

atleast 1000

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