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Find n-th term of series 1, 3, 6, 10, 15, 21
School Accuracy: 75.16% Submissions: 6508 Points: 0

Given a number N, find the Nth term in the series 1, 3, 6, 10, 15, 21…

Example 1:

Input :
N = 4
Output:
10
Explanation:
The 4th term of the Series is 10.

Example 2:

Input :
N = 3
Output:
6
Explanation:
The 3rd term of the Series is 6.

You don't need to read input or print anything. Your task is to complete the function findNthTerm() which takes an Integer N as input and returns the answer.

Expected Time Complexity: O(1)
Expected Auxiliary Space: O(1)

Constraints:
1 <= N <= 104

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