Htaccess - What have I done Wrong in my code?

[webdev]

I have a page http://www.site.com/new 1)I want to redirect http://www.site.com/new/1/ to : http://www.site.com/new?pg=1 2)And redirect http://www.site.com/new/cat/2/ to : http://www.site.com/new?c=cat&pg=2 3)And redirect http://www.site.com/new/cat/ to : http://www.site.com/new?c=cat