  The spin flavor precession (SFP) is investigated in the three neutrino
generation case assuming that the neutrinos are Majorana type. Approximate
analytical formulas including all transition magnetic moments are provided for
the electron neutrino survival probability and electron neutrino -> electron
anti-neutrino transition probability in the SFP framework. The accuracy of the
formulas is checked out for two different magnetic field profiles in the Sun.
