Hi, My website www.riderznet.com is not approved in adsense. i want to know whether if i create a sub domain with my riderznet.com will it get approved??? example: blog.riderznet.com
it depends on why your site was not previously approved. if you build good sub domain it may get approved.
Of course it won't. It's called a subdomain for a reason. If the main domain is not approved why would the subdomain be approved?