6) Write a recursive function to calculate the summation of numbers from 1 to n. For example if the user enters 5, your program would add 1+2+3+4+5 and print out the answer 15. 7) Write a recursive program to calculate Fibonacci numbers. Use the definition of a Fibonacci number where F(n) = F(n-1) + F(n-2).

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A: we need to provide c++ recursive function for sum of natural number .

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A:

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A: Here is the java code. See below step for code

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A: Please find the answer below :

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A: Answer:

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A: NOTE: This is a multiple questions based problem. As per company guidelines only first question is…

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A: The program is completed in python. Here the input is: 45678 Output: 4+5+6+7+8 = 30

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A: To Do: To write the c# code.

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A: I have provided solution in step2.

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A: The JAVA code is given below with output screenshot

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A: In the below step I have pasted the code and commented it please go through it.

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A: The solution to the given problem is below.

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