0
Anonymous
13 + 9 + 2 + 11 + 18 + 13 = 66/6 = 11
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2 + 5 + 11 = 18 2 + 3 + 13 = 18
9.75
2
Prime numbers less than 18 are: 2 3 5 7 11 13 and 17
11 + 2 = 13