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In a class of 25 students, 8 students prefer 'Moped', 7 students prefer 'Bicycle', 17 students prefer 'Auto', 1 students prefer 'Moped' and 'Bicycle', 5 students prefer 'Bicycle' and 'Auto', 7 students prefer 'Auto' and 'Moped', none of the students prefer all the three modes of transport. How many of them prefer only 'Moped'? |