  We present a systematic analysis at the leading log order of the influence of
combination of bilinear and trilinear R-parity violating couplings on the decay
b-->s gamma. Such contributions have never been explored in the context of this
decay. We show that influence of charged-slepton-Higgs mixing mediated loops
can dominate the SM and MSSM contributions and hence can provide strong bounds
on the combination of bilinear-trilinear R-parity violating couplings. Such
contributions are also enhanced by large tan beta. With substantially extended
basis of operators (28 operators), we provide illustrative analytical formulae
of the major contributions to complement our complete numerical results which
demonstrate the importance of QCD running effects.
