I have 32 inch samsung lcd tv and hdmi cable when i plug it to my ps3 says 1080 i/720 p only....why not 1080p

May be...

pls.......help me...i wanna know why?

I have a samsung tv that only accepts 720p and 1080i look at your tv manual and see what signals it can take,my guess is that it cannot take a1080p signal which is classed as full HD.

But 1080i and 720p are HD which give a much better signal than a standard signal.

Most and I mean most TVs under 42 inchs do not support 1080p.

The limitation is in your TV. It obviously only goes up to 1080i/720p. Sorry bro.