 
 <translate> Six persons can be arranged in a row in 6! ways. Treat the three persons to sit together as one unit then there four persons and they can be arranged in 4! ways. Again three persons can be arranged among them selves in 3! ways. Favourable outcomes = 3!4! Required probability = 3!4!/6! = 1/5 So the answer is (C). <ibo> Enwere ike idobe mmadụ isii n'ahịrị n'ụzọ isii. Mee ka mmadụ atọ nọdụ ọnụ dịka otu ihe mgbe ahụ mmadụ anọ na ha nwere ike ịhazi ha n'ụzọ 4. Ọzọkwa mmadụ atọ nwere ike ịhazi onwe ha n'ụzọ atọ. Nsonaazụ dị mma = 3!4! Ihe puru omume achọrọ = 3!4!/6! = 1/5 Ya mere azịza ya bụ (C). 