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We have studied extracting $|\vub/\vcb|$ by calculating the ratios ${\calB}(\bar{B}^0\to D_s^{(*)-}(\pi^+,\rho^+))/{\cal B}(\bar{B}^0\toD_s^{(*)-}D^{(*)+})$ including penguin effects within the factorizationassumption. The ratios involving $\bar{B}^0\to D_s^-D^{+}$ mode haveconsiderable penguin corrections ($\sim 15%$ at the amplitude level), but thoseinvolving $\bar{B}^0\to D_s^-D^{*+}$ mode have relatively small penguincorrections. On the other hand, the $\bar{B}^0\to D_s^-D^{+}$ mode has smallerform-factor dependance. Therefore, these ratios complement each other inmeasuring $\vub/\vcb$. The theoretical uncertainty from the hadronic formfactors in our method is at the level of 15%, which is comparable to themodel-dependence uncertainty of about 20% in the measurement of $| \vub/\vcb |$from the exclusive semileptonic B decays. Using the newest upper limit on $B\toD_s \pi$ decay from CLEO, our method sets an upper limit $| \vub/\vcb | < 0.13$which is very close to the measured values from the semileptonic B decays. Wealso discuss the possible breaking of factorization assumption.Comment: 15 pages, LaTe

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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