Determine if Various Functions are Surjective, Injective, and Bijective

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This video explains how to determine if a function is surjective, injective, bijective or none of these.
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I found this very HELPFUL. In fact this THE video where I DID understood the concept Injective, Surjective and Bijective function clearly

rajkumaarb
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I did not get questions 1 and 3. Could anyone help me?
In question 1, while domain={1, 2, 3}, codomain = {2}, it looks like a subjective function .
In question 3, while x = -1, f(x) = |-1-5| = 6, while x = 11, f(x) = |11-5| = 6, it looks subjective too.

Fyodor-xqly