Question

Look at these growing patterns. Find out what to add to each number to get the next one:

1, 3, 6, 10, ______, ______, ______, ______, ______. 

Answer 1

First number: 1

Second number: 3 (i.e. 1 + 2)

Third number: 6 (i.e. 3 + 3)

Fourth number: 10 (i.e. 6 + 4)

Thus, next number will be

10 + 5 = 15

15 + 6 = 21

21 + 7 = 28

28 + 8 = 36

36 + 9 = 45

So, the final pattern will be: 1, 3, 6, 10, 15, 21, 28, 36, 45.