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

**Example 2:**

Input:N = 2Output:10Explanation: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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