A Question About Pr Domain name

Hello Guys,

I have a domain name
when I check the pr
as www.domain.com
it shows PR3 but when
I check Domin.com without
the WWW , it shows Pr 0.

This is ,thesame
Domain but when I check
with www.Domain.com = Pr 3
But without [WWW] ie . Just
Domain.com it is Just Pr 0

Can somebody with more
experience tell me why this
domain has Two different Pr ?

Thanks

----

Thanks

kumbhak11

I have checked with rankchecker , it shows 2 valid Pr . the one with www. shows Pr 3 and the one without WWW shows pr 0

but I don't know why same domain is showing two different Pr