How to get 'Page N of M' with 'Duplex Print' ???

[CrystalReports9]

Using conditional page formatting with the duplex print setup done in Crystal Report 9.2.3

[Formula Used 'Remainder(PageNumber,2) <>0' and conditionally format “New Page Before” ]

Also if the group value has been changed then i am doing 'reset the page number [ Page N of M].

Question:
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The 'NEWLY CREATED BLANK PAGES' also counted as a page number while showing 'Page N of M'.

How to minus this 'NEWLY CREATED BLANK PAGE' count, while showing 'Page N of M' ???

Is it advisable to use special field 'Page N of M' in the 'both side printing' ??

[or]

Is it adivisable to use the conditional page number formatting in the 'both side printing' option ???

Thank you.