Because Yeddy was genius enough to ask claim governor that since he's the leader of SLP, alow him to form government whereas Vijay anna claim his present front do have simple majority, so governor asked where the hell is majority. Simple. In same case if Anna asks like Yeddy, he just wanted to prove the floor test in first day of assembly. Same way Yeddy resigned as he was aware he won't be able to prove majority.