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Answer:
If x-y is a natural number, then x and y are natural numbers.
Explanation:
The converse of ...
If P, then Q.
is ...
If Q, then P.
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Here, we have ...
P = "x and y are natural numbers"
Q = "x-y is a natural number"
So, the converse is ...
If x-y is a natural number, then x and y are natural numbers.
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In this case, the converse is false.