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Deepak Biloriya 1Deepak Biloriya 1 

how to apply validation rule for picklist

VinayVinay (Salesforce Developers) 
Hi Deepak,

You can use below format for OR and AND condition. 
AND(
ISPICKVAL(Picklist field 1, "lov value"),
ISPICKVAL(Picklist field 2, "lov value")
)

=========

OR(
ISPICKVAL(Picklist field 1, "lov value"), ISPICKVAL(Picklist field 2, "lov value")
)

https://www.salesforceben.com/validation-rules-in-salesforce/

​​​​​​​Please mark as Best Answer if above information was helpful.

Thanks,