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Programming

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Write a function that takes one positive integer value (call it n) as a parameter and produces the sum of the integers between 1 and n.

Hint: The sum of the integers from 1 to n is n*(n+1) all over 2

I know this is how the function should look but I am unsure of how to write the actual code!

(n*(n+1))/2

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    In Visual Basic Form..

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    Create a full program with proper instructions for the user that asks the person to choose between the following options:

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    Properly test the user inputs and respond with error instructions if a wrong or invalid choice is made.

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