can u suggest me which laptop is best in the three...
Samsung NP350V5C-S07IN Laptop (3rd Gen Ci5/ 4GB/ 1 TB/ Win8/ 2GB Graph)
Sony VAIO E15129CN Laptop (3rd Gen Ci7/ 4GB/ 750GB/ Win8/ 2GB Graph)
HP Pavilion 15-n209TX Laptop (4th Gen Ci5/ 4GB/ 1TB/ Win8.1/ 2GB Graph)
Actually the price range of under Rs 50000 is quite below the bar for buying a gaming laptop but anyways there are some laptops you can buy under Rs 50000 for gaming purpose. You should watch this video. It is a nice video listing the best available gaming laptops under Rs 50000. Here is the link:
Get a laptop with at least i5 processor with 4 GB RAM and a 1 GB graphic card. I would suggest Dell XPS 15 but as the laptop has been discontinued by the company so you can go for their Inspirion series which is also good. Dell Inspirion 15 is a good option. If you are a HP fan then you should go for HP Pavilion 15. It is also nice looking laptop with a very fast processor of i5 and 4 GB RAM and 1 GB Graphic card. The laptop would cost somewhere Rs 44000 to Rs 46000. This laptop has been reviewed in the above video link.