Stanley. Stanley takes an oral exam in statistics with several other students. He needs to answer the questions from an examination card drawn at random from the set of 20 cards. There are exactly 8...

Stanley. Stanley takes an oral exam in statistics with several other students. He needs to answer the questions from an examination card drawn at random from the set of 20 cards. There are exactly 8 favorable cards among the 20 to which Stanley knows the answers. Stanley will get a grade of A if he knows the answers, that is, if he draws a favorable card. What is the probability that Stanley will get an A if he draws the card standing in line (a) first, (b) second, and (c) third?