Question

# Function f(x) = 2x + 1 is-

- one-one onto
- one-one
- many one onto
- many one into

Hint:

### A function is said to be bijective or bijection, **if a function f: A → B satisfies both the injective (one-to-one function) and surjective function (onto function) properties**. It means that every element “b” in the codomain B, there is exactly one element “a” in the domain A.

## The correct answer is: one-one

### Given : f(x) = 2x + 1

For, f(x) = 2x + 1 is an one - one function but not onto.

f is one - one as for

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