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Key Terms
nth Term of an Arithmetic Sequence
= + (n – 1)d, where a1 is
the first term of the sequence and d is
its common difference.Sum of the First n Terms of an
Arithmetic Sequence
![]() nth Term of a Geometric Sequence
= rn –
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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