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Arnold Joseph TodasArnold Joseph Todas 

Month Interval - Trigger

Hello guys,

I have two input fields, The first input is number of interval and the secod input is a picklist of months. I have 12 checkbox which is the months.
The validation is once i select any month on picklist the checkbox of particular month will be checked for example i selected March on picklist the checkbox of march will be checked. And the validation for interval is for example i selected March and the interval is 2, The checkbox of March, May,July,September, November, December will be checked. How can i create a trigger for that?

Thanks for help!
Arnold Joseph TodasArnold Joseph Todas
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Better explanation for it.. how can i create trigger for that output?