error in function definition

Can someone tell me what is wrong with this C++ function definition please?

Code:

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void Test1 ( int m,
            int n)

{
    return 3*m+n;
}

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Your return type is wrong.

Code:

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int Test1 ( int m, int n)  //Note the "int"
{
    return 3*m+n;
}

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