Question

I don't know what Arithmetic sequence is?that's why i need help.

Answer 1

An arithmetic sequence is a mathematical succession in which the difference between a pair of successive terms in the sequence is constant. For example:

$4,7,10,13,16,19\ldots$

That is an arithmetic sequence with a constant difference of 3.

$14,9,4,-1,-6\ldots$

That is an arithmetic sequence with a constant difference of -5.