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In mathematical logic, two statements, X and Y, are true if and only if both X as well as Y are true. So if either X or Y (or both) are false then "X and Y" is a false statement. Similarly, if some conditions, S and T, need to be satisfied by a variable then S as well as T must be satisfied.

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8y ago
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8y ago

It usually signifies addition.

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Q: In math what does the word and mean?
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