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Anonymous
It is: 17+25+15 = 57 and 57/3 = 19 which is the average
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17 + 25 + 15 = 57
15
They are: 17, 19 and 23
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
25-17 = 8