nth term in a sequence

Geometric Sequence








e.g. Find 7th term of (2, 6, 18, 54, ...)
n = 7;  a₁ = 2, r = 3 An = 1458



 Arithmetic Sequence 

e.g. Find 10th term of (3, 5, 7, 9, ...)

n = 10;  a₁ = 3, d = 2 An = 21