From 6 different novels and 3 different dictionaries, 4 novels and I dictionary are to be selected and arranged in a row on a self so that the dictionary is always in the middle. The number of such arrangement is
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a
less than 500
b
at least 500 but less than 750
c
at least 750 but less than 1000
d
at least 1000
answer is D.
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Detailed Solution
Required number of ways is 6C4×3C1×4!=1080Clearly, it is more than 1000. So, option (d) is correct