jee-main 2018 Q63

jee-main · India · 08apr Permutations & Arrangements Selection and Task Assignment

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 750 but less than 1000
(2) At least 1000
(3) Less than 500
(4) At least 500 but less than 750

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 750 but less than 1000\\
(2) At least 1000\\
(3) Less than 500\\
(4) At least 500 but less than 750

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