"Here, there are three major parties. BJP is the single largest party, Congress is second and JD (S) is third. Now, the Congress-JD (S) combine outweigh the BJP. Then, in this situation, on what basis he (Yeddyurppa) has staked claim to form the governmentIJ We do not have those letters. It's only on surmises. The arithmetic is such that defies on what basis it was done," the bench observed.