One-one is also known as injective.

Onto is also known as surjective.

Both
one-one
and
onto
are known as
**
bijective
**
.

## Check whether the following are bijective.

Function is one one and onto.

∴ It is
**
bijective
**

Function is one one and onto.

∴ It is
**
bijective
**

Function is not one one and not onto.

∴ It is
**
not bijective
**

Function is one one but not onto.

∴ It is
**
not bijective
**