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Question

f:[4,3)A, let f(x)=x2+2 is a function. Then which of the following represents set A

A
[2,18]
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B
[2,11)
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C
[2,18)
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D
[2,11]
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Solution

The correct option is A [2,18]
f(x)=x2+2 in x[4,3)
x2+22
Now,
x2+2=2 at x=0[4,3)
Also,
f(4)=18, f(3)=11f(x)[2,18], x[4,3)

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