And, Or, NOT – DAX Guide

The logical and operator && returns TRUE if both arguments are TRUE, and returns FALSE if any of the arguments is FALSE.
https://dax.guide/op/and/

The logical or operator || returns TRUE if any of the arguments are TRUE, and returns FALSE if all arguments are FALSE.
https://dax.guide/op/or/

NOT inverts the state of a boolean expression, transforming FALSE to TRUE, or TRUE to FALSE.
https://dax.guide/op/not/

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