Into Function

Q.

Which of the following function is an into function if all are defined on f: R $\to$ R

1. f(x) = sin(x)

2. f(x) = cos(x)

3. f(x) = $e^x$

4. All of the above

Q.

Function f(x) = {x} on f: R $\to$ R where {} is fractional part function, is an into function.

1. True

2. False

Q.

What should be the relation between range and codomain of a function, for a function to be an into function -

1. Range < Co domain

2. Range > Co domain

3. Range = Co domain

4. None of the above.