Probability Problem Help Please?

1. A smuggler, trying to pass himself off as a glass-bead importer, attempts to smuggle diamonds by mixing diamond beads among glass beads in the proportion of one diamond bead per 1000 glass beads. A harried customs inspector examines a sample of 100 beads. What is the probability that the inspector's sample will contain atleast one diamond bead, that is what is the probability that the smuggler will be caught (use an asymptotic approximation to the Binomial to obtain a numerical answer)?