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The domain and range might not always be ℝ, so for this set we’re going to...

The domain and range might not always be ℝ, so for this set we’re going to look at functions with more interesting domain and codomain. Which of these are onto?

1. ?:ℤ → ℤ10 defined by ?(?) = ? mod 10.

2. ?:ℤ10 → ℤ defined by ?(?) = ?.

3. ?:ℤ20 → ℤ10 defined by ?(?) = ? mod 10.

4. ?:ℤ10 → ℤ20 defined by ?(?) = 2? mod 20.

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