We discuss the decay of B-c mesons into two light mesons (pi,K-(*),eta((')),rho,omega,phi). All these decay channels come from a single type of diagram, namely, tree annihilation. This allows us to derive extremely simple SU(3) relations among these processes. The size of annihilation contributions is an important issue in B physics, and we provide two different estimates in the case of nonleptonic charmless B-c decays, either a comparison with annihilation decays of heavy-light mesons or a perturbative model inspired by QCD factorization. We finally discuss a possible search for these channels at LHCb.
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