Any set that contains -1.5, whether finite or infinite.
For example,
the set consisting of only -1.5 ie {-1.5},
the set consisting of -1.5 and 5 = {-1.5,5},
the set consisting of -1.5 and 3 and sqrt(17) = {-1.5,3,sqrt(17)}, and so on.
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19 doesn't belong. The rest of the numbers are multiples of 3.
Well there are quite a few numbers that added together will equal negative 15: here are just a few examples: negative 1 plus negative 14 equals negative 15 (-1 + -14 = -15) negative 2 plus negative 13 equals negative 15 (-2 + -13 = -15) negative 3 plus negative 12 equals negative 15 (-3 + -12 = -15) negative 4 plus negative 11 equals negative 15 (-4 + -11 = -15) negative 5 plus negative 10 equals negative 15 (-5 + -10 = -15) negative 6 plus negative 9 equals negative 15 (-6 + -9 = -15) negative 7 plus negative 8 equals negative 15 (-7 + -8 = -15) negative 30 plus positive 15 equals negative 15 (-30 + 15 = -15) negative 29 plus positive 14 equals negative 15 (-29 + 14 = -15) negative 28 plus positive 13 equals negative 15 (-28 + 13 = -15) and on an on it goes.
115
3, -15
(-15) x 4 = -60 -15 + 4 = -11 ~Jason