The suggested solution would add the following to the bottom of the page:

3 - 1 // 3

But I would question the need for this requirement. The relevant
information on a particular page is the "current page number". The
previous page number is obviously "current page number" - 1 (it
doesn't seem useful to display). I am keen to know from the OP, what
is the real need for this requirement.

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Regards,
Mukul Gandhi