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If a logical function's input comprises numbers, the value of zero is FALSE, but the value of all other numbers, including negative numbers, is TRUE. If cells A1:A5 contain numbers, for example, the formula =AND(A1:A5) returns TRUE if none of the cells contain 0, and FALSE otherwise.

The logical AND operator is &&. ! is a NOT operator, while || is a logical OR operator. As a result, the logical operator '&' is not one.

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