The concept of function

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Let $X=\{a,b,c\}$ and $Y=\{1,2,3\}$ . Below are various relations from $X$ to $Y$ .
Which of these relations are functions from $X$ to $Y$ , and which are not?

Drag each relation to the correct column.

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$\bigl\{(a,1), (b,3), (c,2)\bigr\}$

$\bigl\{(a,1), (b,2), (c,2)\bigr\}$

$\bigl\{(a,1), (a,2), (b,2), (c,3)\bigr\}$

$\bigl\{(a,1), (b,1), (c,1)\bigr\}$

$\bigl\{(a,1), (c,3)\bigr\}$

no function

yes, a function

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