SparkNotes: SAT Subject Test: Math Level 2: Key Terms

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12.1	Logic

12.2	Sequences

12.3	Limits

12.4	Imaginary and Complex Numbers

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

r_n – 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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