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<Moderator's note: Moved from a technical forum and thus no template.>

Here is a problem and solution given in my book.

this is using a symbol in cartesian product .

I checked other books for cartesian product examples but there was

Is my solution wrong ?

I'm confused.

Here is a problem and solution given in my book.

this is using a symbol in cartesian product .

I checked other books for cartesian product examples but there was

**no such symbol being used**.**Here is my solution without that symbol**Is my solution wrong ?

I'm confused.

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