SparkNotes: SAT Subject Test: Math Level 1: Key Formulas

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12.1	Logic

12.2	Sequences

12.3	Limits

12.4	Imaginary and Complex Numbers

Key Formulas

nth Term of an Arithmetic Sequence

a_n = 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

b_n = b₁r_{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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