# Program to find the nth term of the series -2, 4, -6, 8….

Given a number N, the task is to find the Nth term of the following series.

-2, 4, -6, 8……

Examples:

```Input: n=4
Output: 8

Input: n=3
Output: -6
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: By clearly examining the series we can find the Tn term for the series and with the help of tn we can find the desired result.

Tn=-2 + 4 -6 +8 …..
We can see that here odd terms are negative and even terms are positive
Tn=2(-1)nn
Tn=(-1)n2n

Below is the implementation of above approach.

## CPP

 `// C++ implementation of the approach ` ` `  `#include ` `using` `namespace` `std; ` ` `  `// Function to return the ` `// nth term of the given series ` `long` `Nthterm(``int` `n) ` `{ ` ` `  `    ``// nth term ` `    ``int` `Tn = ``pow``(-1, n) * 2 * n; ` ` `  `    ``return` `Tn; ` `} ` ` `  `// Driver code ` `int` `main() ` `{ ` `    ``int` `n = 3; ` ` `  `    ``cout << Nthterm(n); ` ` `  `    ``return` `0; ` `} `

## Python

 `# Python3 implementation of the approach   ` `    `  `# Function to return the nth term of the given series   ` `def` `Nthterm(n):   ` `    `  `    ``# nth term   ` `    ``Tn ``=` `((``-``1``)``*``*``n) ``*` `(``2` `*` `n)  ` `    `  `    ``return` `Tn;   ` `    `  `    `  `# Driver code   ` `n ``=` `3` `print``(Nthterm(n)) `

## Java

 `// Java implementation of the approach ` `import` `java.util.*; ` `import` `java.lang.*; ` `import` `java.io.*; ` ` `  `public` `class` `GFG { ` ` `  `    ``// Function to return the nth term of the given series ` `    ``static` `int` `NthTerm(``int` `n) ` `    ``{ ` `        ``int` `Tn ` `            ``= ((``int``)Math.pow(-``1``, n)) * ``2` `* n; ` ` `  `        ``return` `Tn; ` `    ``} ` ` `  `    ``// Driver code ` `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` `        ``int` `n = ``3``; ` `        ``System.out.println(NthTerm(n)); ` `    ``} ` `} `

## C#

 `// C# implementation of the approach ` `using` `System; ` `public` `class` `GFG { ` ` `  `    ``// Function to return the nth term of the given series ` `    ``static` `int` `NthTerm(``int` `n) ` `    ``{ ` ` `  `        ``int` `Tn ` `            ``= ((``int``)Math.Pow(-1, n) * 2 * n); ` ` `  `        ``return` `Tn; ` `    ``} ` ` `  `    ``// Driver code ` `    ``public` `static` `void` `Main() ` `    ``{ ` `        ``int` `n = 3; ` `        ``Console.WriteLine(NthTerm(n)); ` `    ``} ` `} `

## PHP

 `   `

Output:

```-6
```

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