Key Formulas
12.1 Logic
 
12.2 Sequences
 
12.3 Limits
 
12.4 Imaginary and Complex Numbers
 
 
12.5 Key Formulas
 
12.6 Review Questions
 
12.7 Explanations
 
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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