one number column Starting with the second term, where each term and its predecessor are tantamount to one constant number, the number column is called Equal number column. This constant number is called Equal number column common ratio, which is usually denoted by letter q (q≠0), Equal number column a1≠ 0. Note: When q=1, an is a constant number column.

general formulas: a _n = [a ₁ q ^{(n - 1)} ]

a₁ - first item

n - item count

Q-common ratio