Which of the following numbers are triangular numbers?

(i) 3 (ii) 8 (iii) 10 (iv) 12

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

The dot pattern of the numbers 3 and 10 can be expressed as a triangle, as shown below:



So, the numbers 3 and 10 are triangular numbers.

The numbers 8 and 10 cannot be expressed as triangles, so they are non-triangular numbers.

Answered by  | 4th Jun, 2014, 03:23: PM