Which of the following are progressions?

a) Permutations

b) Sequences

c) Combinations

d) Series

e) Probability

b. Sequences

Step-by-step explanation:

The following are progressions:

b. Sequences

We have two sequences - arithmetic progression and geometric progression.

A sequence is an arithmetic sequence if the two consecutive numbers have a common difference.

A sequence is a geometric sequence, if the ratio of two consecutive numbers is common.

The sum of the terms of a sequence is called a series. So, in a rather informal way, this can also be considered.

In mathematics: Arithmetic progression, sequence of numbers such that the difference of any two successive members of the sequence is a constant. Geometric progression, sequence of numbers such that the quotient of any two successive members of the sequence is a constant. so i chose b) Sequences