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If lim(x to 7) (18-[1-x])/[[x-3a]] exist...

If `lim_(x to 7) (18-[1-x])/[[x-3a]]` exists, where `[.]` represents greatest integer function, then the value of `a` is (where `alpha in I`)

A

-2

B

-3

C

-6

D

-7

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