Stat.... stat.....:)?

A panel of 300 persons chosen for jury duty included only 30 persons under 25 years of age.For a partıcular narcotics case,the actual jury of 12 selected from this panel did not contain anyone under the age of 25.The youthful defendant's attorney complained that this jury of 12 is not representative.He argued that the probability of having one of the 12 jurors under 25 years of age should be many times the probabiliy of having none of them under 25 years of age.Find the ratio of these two probabilities. (ıt ıs vry ımportant for me please help me)