(10 points) A study is being conducted in which the health of two independent groups of policyholders is being monitored over a one-year period. Group A contains 10 participants and individual participants in the study drop out before the end of the study with probability 02 (independent of other participants). Group B contains 11 participants and individual participants in the study drop out before the end of the study with probability 0.3 (independent of other participants). What is the probability that at least 9 participants complete the study in exactly one of the two groups