6, 11, 18, 27, 38, ?
6 + 5 = 11 11 + 7 = 18 18 + 9 = 27 27 + 11 = 38 38 + 13 = 51
In a lottery, there are 8 prizes and 20 blanks. A lottery is drawn at random. What is the probability of getting a prize?
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