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**1. **Write a Python program to calculate the sum of a list of numbers. Go to the editor

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**2. **Write a Python program to converting an Integer to a string in any base. Go to the editor

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**3. **Write a Python program of recursion list sum. Go to the editor

Test Data : [1, 2, [3,4], [5,6]]

Expected Result : 21

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**4. **Write a Python program to get the factorial of a non-negative integer. Go to the editor

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**5. **Write a Python program to solve the Fibonacci sequence using recursion. Go to the editor

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**6. **Write a Python program to get the sum of a non-negative integer. Go to the editor

*Test Data* :

sumDigits(345) -> 12

sumDigits(45) -> 9

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**7. **Write a Python program to calculate the sum of the positive integers of n+(n-2)+(n-4)... (until n-x =< 0). Go to the editor

*Test Data* :

sum_series(6) -> 12

sum_series(10) -> 30

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**8. **Write a Python program to calculate the harmonic sum of n-1. Go to the editor

*Note* : The harmonic sum is the sum of reciprocals of the positive integers.

Example :

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**9. **Write a Python program to calculate the geometric sum of n-1. Go to the editor

*Note* : In mathematics, a geometric series is a series with a constant ratio between successive terms.

Example :

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**10. **Write a Python program to calculate the value of 'a' to the power 'b'. Go to the editor

*Test Data* :

(power(3,4) -> 81

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** ****11. **Write a Python program to find the greatest common divisor (gcd) of two integers. Go to the editor

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