Choose a share for intraday and apply this formula
H+L+C=A (where H= Previous day high, L=Previous day low, C=Previous day close, A= sum. of H L &C)
A*0.67=Z (0.67 is a constant fraction and Z=Result)
Z- H = S (S = Support for that day)
Z- L = R (R = Resistence for that day)
Z- C = P.B (P.B = Possible Buy)
If P.B is found nearer to R sale it for intraday
This is called FRACTION THEORY and every one can get support resistence for nifty /sensex by this method.
try this theory and it is very effective .