Choose arithmetic or geometric, enter the first term, the difference or ratio and n, and get the nth term and sum.
Arithmetic sequences add a constant difference each term; geometric sequences multiply by a constant ratio.
Arithmetic: aₙ = a₁ + (n−1)d; geometric: aₙ = a₁ × r^(n−1), using the first term and the common difference or ratio.
Yes — it returns the sum of the first n terms using the appropriate arithmetic or geometric sum formula.