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Difference series
Basic Accuracy: 52.14% Submissions: 328 Points: 1

Given a series of numbers  3,10,21,36 …., and series starting from N = 1, find the pattern and output the N'th value of the above series.

Example 1:

Input:
N = 1
Output:
3
Explanation:
3 is the first term of the series.

Example 2:

Input:
N = 2
Output:
10
Explanation:
10 is the second term of the series.

Your Task:  
You don't need to read input or print anything. Your task is to complete the function differenceSeries() which takes an integer N as input parameter and returns the N'th term of the series.

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

Constraints:
1 ≤ n ≤ 100

 

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Difference series

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