If A = {1, 2, 3}, B = {a, b, c} and R = {(1, a), (2, a), (3, b)} then R is____?

One-one function

Onto function

Into function

None of these

Every element of set A is related to an element in B, so it's a function.

Since not every element of B is mapped (e.g., c is not an image), it’s into function.