Dependent values in formula validation in salesforce

 If you are looking for a formula in which the fields are dependent to each other than you can use below formula.

In below formula the validation is if user fills out Field A then Field B must also be filled and vice versa.

1	IF(ISBLANK(FieldA__c),0,1)+IF(ISBLANK(FieldB__c),0,1)=1

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