Asked by Anonymous

Verbally describe this pattern
1,3,6,10,15,21
Answered by Steve
The nth term is the sum of the first n positive integers.

Or, starting with 1, add 1. Then increase the amount added by 1 for each term. That is, the next amounts added are
2,3,4,5,...
Answered by duck
add the last two numbers in the begining add 1 three times