Question

Let a mapping f be defined from $\left[ - \frac{1}{2} , \frac{1}{12} \right]$ to $\left[ - \frac{1}{2} , \frac{1}{12} \right]$ . Which one of the following $f$ defines a one-one onto mapping?

• A. $f (x) = x$
• B. $f (x) = \frac{1}{2} x $
• C. $f (x) = x^2 $
• D. $f (x) = | \frac{1}{2} x | $

Answer 1

Answer: (B)

Correct answer is (b) $f (x) = \frac{1}{2} x $