Today i planned to Play GTA V on my PC. So i require some Specs for My pc. I have computer/laptop of 2gb RAM that is not enough to play that game. So decided to buys some 4gb RAM for my laptop. Can i Add 2gb RAM and 4gb RAM to make it 2+4=6GB RAM?
Can I Use Two RAMS of Different Size in Laptop?
memory
Yes.  You can use two SODIMMS of different capacity.   Case in point, my MSI GL62 shipped with 12GB of ram, an 8GB and a 4GB SODIMM.  The same goes for a Desktop with full length DIMMS.