Let A = {1, 2, 3} and B = {a, b} be two sets.
Question:

Let A = {1, 2, 3} and B = {ab} be two sets. Then the number of constant functions from A to B is ___________.

Solution:

Given: Sets A = {1, 2, 3} and B = {ab}

Two constant functions can be formed from A to B.
i.e., one is f(x) = a and other is f(x) = b

Hence, the number of constant functions from A to B is 2.

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