Sequences and Summation Formulas
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∑k
[n(n+1)]/2
∑c
cn
geometric sequence sum
[a(1-rⁿ)]/(1-r)
arithmetic sequences sum
[n(a1+an)]/2
∑k²
[n(n+1)(2n+1)]/6
∑k³
[n²(n+1)²]/4
geometric sequence
a(r)ⁿ⁻¹
arithmetic sequence
a+(n-1)d
∑ca
c∑a
∑(a+b)
∑a + ∑b
