Question

Find the number of dots in the tenth figure of the following pattern.

Answer 1

The number of dots given is 1, 3, 6, 10, 15 ...

Pattern	Number of dots
1	1
2	3
3	6
4	10
5	15

1^st number = 1

2^nd number = 1 + 2 = 3

3^rd number = 3 + 3 = 6

4^th number = 6 + 4 = 10

5^th number = 10 + 5 = 15

6^th number will be 15 + 6 = 21

7^th number will be 21 + 7 = 28

8^th number will be 28 + 8 = 36

9^th number will be 36 + 9 = 45

10^th number will be 45 + 10 = 55

Number of dots in the 10^th figure = 55