Sum of geometric progressionProblem Statement:Write a program to read two numbers, x, and n, and then compute the sum of this geometric progression:1+x+x2+x3+………….+xn using functions.For example: if n is 3 and x is 5, then the program computes 1+5+25+125.At the time of execution, the program should print the message on the console as: >Enter x value : For example, if the user gives the input as:Enter x value : 3Now, the program should print the message on the console as:Enter n value : For example, if the user gives the input as:Enter n value : 5then the program should print the result as:Sum of the series 1 + x + .... + x ^ 5 = 364Instructions:Your input and output must follow the input and output layout mentioned in the visible sample test case.Hidden test cases will only pass when users' input and output match the expected input and output.Sample Test CasesTest Case 1:Expected Output:35364Test Case 2:Expected Output:2315
Question
Sum of geometric progressionProblem Statement:Write a program to read two numbers, x, and n, and then compute the sum of this geometric progression:1+x+x2+x3+………….+xn using functions.For example: if n is 3 and x is 5, then the program computes 1+5+25+125.At the time of execution, the program should print the message on the console as: >Enter x value : For example, if the user gives the input as:Enter x value : 3Now, the program should print the message on the console as:Enter n value : For example, if the user gives the input as:Enter n value : 5then the program should print the result as:Sum of the series 1 + x + .... + x ^ 5 = 364Instructions:Your input and output must follow the input and output layout mentioned in the visible sample test case.Hidden test cases will only pass when users' input and output match the expected input and output.Sample Test CasesTest Case 1:Expected Output:35364Test Case 2:Expected Output:2315
Solution
The problem is asking to write a program that calculates the sum of a geometric progression. The progression starts from 1 and ends at x^n. The values of x and n are provided by the user.
Here is a step-by-step solution in Python:
- First, we need to define a function that calculates the sum of the geometric progression. The formula for the sum of a geometric progression is: S = a*(r^n - 1) / (r - 1), where a is the first term, r is the common ratio, and n is the number of terms. In our case, a is 1, r is x, and n is the number of terms.
def geometric_sum(x, n):
return (x**(n+1) - 1) / (x - 1)
- Then, we need to get the input from the user for the values of x and n. We use the input() function for this, and since input() returns a string, we need to convert the values to integers using the int() function.
x = int(input("Enter x value : "))
n = int(input("Enter n value : "))
- Finally, we call our function with the input values and print the result.
print("Sum of the series 1 + x + .... + x ^", n, "=", geometric_sum(x, n))
The complete program looks like this:
def geometric_sum(x, n):
return (x**(n+1) - 1) / (x - 1)
x = int(input("Enter x value : "))
n = int(input("Enter n value : "))
print("Sum of the series 1 + x + .... + x ^", n, "=", geometric_sum(x, n))
This program will calculate and print the sum of the geometric progression based on the user's input.
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