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Key Formulas
nth Term of an Arithmetic Sequence
an = a1 +
(n – 1)d, where a1 is
the first term in the sequence, and d is the common
difference.
Sum of the First n Terms of an
Arithmetic Sequence
nth Term of a Geometric Sequence
bn = b1rn –
1, where b1 is
the first term of the sequence and r is the common
ratio.
Sum of the First n Terms of a Geometric
Sequence
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