Given a number N, the task is to find Nth 120-gon number.
A 120-gon number is a class of figurate numbers. It has 120 – sided polygon called 120-gon. The N-th 120-gon number count’s the 120 number of dots and all other dots are surrounding with a common sharing corner and make a pattern. The first few 120-gon numbers are 1, 120, 357, 712, 1185, 1776, …
Input: N = 2
The second 120-gonol number is 120.
Input: N = 3
Approach: The N-th 120-gon number is given by the formula:
- Nth term of s sided polygon =
- Therefore Nth term of 120 sided polygon is
Below is the implementation of the above approach:
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