sequences and summations test
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Arithmetic Sequence
Aₙ = A₁ + d(n-1)
Geometric Sequence
Aₙ = A₁rⁿ⁻¹
Geometric Finite Sum
Sₙ = A₁ ((1-rⁿ)/ (1-r))
Geometric Infinite Sum
Sₙ = A₁/ (1-r)
Arithmetic Summation
Sₙ = n/2 (A₁ + Aₙ)
