Question

Write the next two numbers in the sequence: 1, 3, 6, 10, 15...*

Answer 1

21,28

Explanation:

3-1=2 2+1=3

6-3=3 3+3=6

10-6=4 4+6=10

15-10=5 5+10=15

6+15=21

7+21=28

Answer 2

The answers are 21 and 28