Question

If f(A) is a proper subset of B then f: A$\to$B is called a/an_______ function

• A. into
• B. onto
• C. one-one
• D. indentity

Answer 1

Answer: (A)

into

A function is said to be an into function from Set A to set B, if atleast one element of B is not connected to an element of A.
Here, when A is a proper subset of B, clearly, it will have lesser elements than set B, and those extra elements of set B will not be connected to any element of Set A. So it is an into function.