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Let f : (1, 3)  R be a function defined by f(x) = 2 x 1 ] x [ x  , where [x] denotes the greatest integer  x. Then the range of f is :

1.               5 4 , 4 3 5 3 , 5 2
2.               5 4 , 5 3 2 1 , 5 2
3.        5 4 , 5 2
4.       5 4 , 5 3

Correct answer:               5 4 , 5 3 2 1 , 5 2

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