Other

Many sequences do not follow the pattern of geometric or arithmetic. These sequences have their own patterns. Some can be modeled by other polynomial functions.1, 3, 6, 10, 15, 21, 28, 36, 45 …

By adding another row of dots and counting all the dots, we can find the next number of the sequence.This sequence is generated from a pattern of dots that form a triangle.

The symbolic pattern for this sequence is to add 2 to the first term, add 3 to the second term, add 4 to the fourth term and so on. This type of sequence has a constant second difference and can be modeled by the quadratic function .