Probability question please help !!!?

A bottle contains 100 flies. 90 flies are wild type and 10 are not wild type. If 10 flies are examined what is the probability that no fly will be a mutant? In ten independent observations how many times would you miss the mutant flies? Suppose 99 are wild type and only one is a mutant. What is the probability your sample of 10 will not have a mutant fly? How many observations would give you a probability of 0.5 or greater of finding the mutant fly?