Re-write this piece of code using recursion: You will ONLY output the value 15 to the screen, not intermediate values along the way. You may NOT use cout within your recursive function. int sum 0; for (int i = 0; i < 5; i++) { sum += i; cout << sum;

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A: As per guidelines we are supposed to answer only 3 question at a time. Kindly repost other questions…

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A: The code is given below.

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A: The complete C++ code is given below

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Declaring and Defining the function

A set of statements, which performs a particular task is called a function. The program gains modularity by using function. The application is quite easy to understand, read, and edit when they are created with functions. The developer/programmer creates a function and uses main() to call the function. Once the function gets executed, the control is transferred to the main program.