Lesson: Chapter - 12

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

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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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