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The set of all values of a for which a x lim  ( [x – 5 ] – [2x + 2]) = 0, where [  ] denotes the greatest integer less than or equal to  is equal to

1. [ – 7.5, – 6.5)
2. ( – 7.5, – 6.5]
3. [ – 7.5, – 6.5]
4. ( – 7.5, – 6.5)

Correct answer: ( – 7.5, – 6.5)

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