Expression to replace Multi Picklist fields in Salesforce

Expression to replace Multi Picklist fields in Salesforce

Hi,

We were wondering if anyone else has implemented this before.

We have a Multipicklist field in Salesforce that needs to be mapped to multiple checkboxes in Salesforce,

Question 1: Is this the correct way of populating the checkboxes if one of the selections is set to "All Emails"?

(find_string(Opt_Out__c,'All Emails',1)) != 0


Question 2: We need to populate a field with yes or no if the multi picklist is  set to "Appeals"

(find_string(Opt_Out__c,'Appeals',1)) ? 'No' : 'Yes'

This one is currently throwing an error.

Thank you for your help.

Ramtin