The "Make me a millionaire" is a weekly talent show that consists of asking 10 questions to the participant. In each show, the participant is asked 10 questions drawn at random from a randomly chosen test bank of the many test banks secretly kept by the organizers. These test banks are such that 30% of them contain 15 questions, 5 of which have already been asked in past contests and 70% of them contain 20 questions, 7 of which have been asked in past contests. A new participant is going to be participating in this week's contest. Calculate the probability that the participant will be asked 3 questions that were asked in past contestst