Is it possible to set multiple default values for a checkbox?

Question

We have a days of the week working pattern that the user can select any of Mon, Tue, Wed, Thu and Fri from, so the list has a Choice with multiple values allowed.

Ok can set the default value to Mon and SharePoint is happy, but is it possible to set it to multiple values?

I looked at manually created items and the field was showing ...

;#Mon;#Tue;#Wed;#Thu;#Fri;#
;#Wed;#Thu;#Fri;#
;#Mon;#Wed;#Thu;#
;#Mon;#Tue;#Wed;#Thu;#Fri;#

But tried those as defaults and SharePoint objected :-(

Answer 1

1. Go to List Settings
2. Edit your field
3. Change the "Default value:" radio button to be "Calculated Value"
4. Enter a formula like: =";#Mon;#Wed;#Thu;#"