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Nagaraju Mogili 22Nagaraju Mogili 22 

Hi ,I have a requirement with validation rule,

I have a text field "Student Marks" which allows only numbers and fixed string.( numbers >=100 and string "AB").

I have to write a validation for this.can anyone help me out with this.

Thanks in advance. 
Varun SinghVarun Singh

Formula for validation-->

NOT(Or(Student_Marks__c='AB' ,Value(Student_Marks__c)>100))