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Question

Let f(x)=x2+2[x], 1x3, where [.] denotes greatest integer function, then incorrect statement is

A
f(x) is increasing in [1,3]
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B
least value of f(x) is 3
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C
f(x)has no greatest value
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D
domain of f(x) is (1,3){2}
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Solution

The correct option is A f(x) is increasing in [1,3]
f(x)=⎪ ⎪ ⎪⎪ ⎪ ⎪x2+21x<2x2+222x<3113x=3


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