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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.
Your Task:
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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