Question

Observe the dot pattern arranged in triangles. How many dots will be there in the next triangle?

• A. 8
• B. 9
• C. 10
• D. 11

Answer 1

The correct option is C

10

We can observe that the number of dot in the triangular figure is as follows

1, 3, 6 ..... and so on

First number is $1$

Second number is $1+2=3$

Third number is $1+2+3=6$

Similarly, fourth number will be

$1+2+3+4=10$

Hence, the next triangle will have 10 dots.