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.

no because after the troops were pulled many blacks were killed by hangings lynchings and other cruel ways which in a way interrupted the reconstruction of the south and differed from the way abraham lincoln had an idea of reconstruction