a) 1, 3, 6, 10, S.
b) 0, 2, 6, 12,
c) 1, 3, 7, 13,
d) 2, 3, 6, 11, 18,
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Substitution reaction, any of a class of chemical reactions in which an atom, ion, or group of atoms or ions in a molecule is replaced by another atom, ion, or group.
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