3) A pharmaceutical company is about to introduce a new drug to the market. Before that can be done, an independent research company is carrying out an analysis of the drug's effectiveness. Due to the specifics of the condition for which the drug is intended, three different age groups are considered, A (18-35 years old), B (36-50 years old), and C (51-65 years old). The possible outcomes of the test were 'effective' and 'non-effective'. The following results have been compiled; Age group Test result A B C Effective 88 76 71 Non-effective 12 24 29 Based on these observations, a) What is the probability that the drug is effective? b) What is the probability that a 60-year-old person having the condition in question will be treated successfully? c) If a person was treated successfully, what is the probability that he/she belongs to the age group A