for a given compound how to determine what hybridisation?

Hybridisation in a molecule can be calculated from the following relation:

H=1/2[ V + X - C + A]

where V= number of  valence electrons in  central atom, X=number of monovalent atoms around the central atom, C= +ve charge on cation and A= -ve charge on anion

For example in H₂SO₄, to find the hybridization of sulphur:

V = 6, X = 2, C = 0, A = 0

H = ½[6+2] = 4 = sp³

In above structure, the two oxygen atoms are considered as coordinated bonded and treated as single bond. Use the following table to match the possible values of H with the corresponding hybridisation