  We present here the exact solution of an infinite range, discrete, opinion
formation model. The model shows an active-absorbing phase transition, similar
to that numerically found in its recently proposed continuous version
(Lallouache et al., Phys. Rev E 82, 056112 (2010)). Apart from the two-agent
interactions here we also report the effect of having three agent interactions.
The phase diagram has a continuous transition line (two agent interaction
dominated) and a discontinuous transition line (three agent interaction
dominated) separated by a tricritical point.
