 # Python Program to Find Sum of Series (1+(1*2)+(1*2*3)+…till N)

In the previous article, we have discussed Python Program to Find Sum of Series (1+(1+2)+(1+2+3)+…till N)
Given a number N and the task is to find the sum of the given series (1+(1*2)+(1*2*3)+…till N) for the given number in Python.

Examples:

Example1:

Input:

Given Number = 13

Output:

The total sum of the series till the given number { 13 } = 6749977113

Example2:

Input:

Given Number = 7

Output:

The total sum of the series till the given number { 7 } =  5913

## Program to Find the sum of series (1+(1*2)+(1*2*3)+…till N) in Python

Below are the ways to find the sum of the given series (1+(1*2)+(1*2*3)+…till N) for the given number in Python :

### Method #1: Using While Loop (Static Input)

Approach:

• Give the number N as static input and store it in a variable.
• Take a variable say resltsum which gives the sum of the given series till N and initialize its value to 0.
• Take another variable say k and initialize its value with 1.
• Loop until the value of k is less than or equal to the given number using the while loop.
• Inside the loop take a variable say gvn_multiplr and initialize its value with 1.
• Iterate from 1 to the value of k using the for loop.
• Multiply the iterator value to the above-initialized gvn_multiplr and store it in the same variable gvn_multiplr.
• Add the above-obtained value of gvn_multiplr to the resltsum outside the for loop.
• Store it in the same variable resltsum.
• Increment the value of k by 1 outside the for loop.
• Print the resltsum value which is the result of the series till the given Number N.
• The Exit of the Program.

Below is the implementation:

# Give the number N as static input.
# store it in a variable.
gvn_numb = 13
# Take a variable say resltsum which gives the sum of the given series till N and
# initialize its value to 0.
resltsum = 0
# Take another variable say k and initialize its value with 1.
k = 1
# Loop until the value of k is less than or equal to the given number using the while loop.
while(k <= gvn_numb):
# Inside the loop take a variable say gvn_multiplr and initialize its value with 1.
gvn_multiplr = 1
# Iterate from 1 to the value of k using the for loop.
for itr in range(1, k+1):
# Multiply the iterator value to the above-initialized gvn_multiplr and store it in the same
# variable gvn_multiplr.
gvn_multiplr *= itr
# Add the above-obtained value of gvn_multiplr to the resltsum outside the for loop.
# Store it in the same variable resltsum.
resltsum += gvn_multiplr
# Increment the value of k by 1 outside the for loop.
k += 1
# Print the resltsum value which is the result of the series till the given Number N.
print(
"The total sum of the series till the given number {", gvn_numb, "} = ", resltsum)


Output:

The total sum of the series till the given number { 13 } =  6749977113

### Method #2: Using While loop (User Input)

Approach:

• Give the number N as user input using the int(input()) function and store it in a variable.
• Take a variable say resltsum which gives the sum of the given series till N and initialize its value to 0.
• Take another variable say k and initialize its value with 1.
• Loop until the value of k is less than or equal to the given number using the while loop.
• Inside the loop take a variable say gvn_multiplr and initialize its value with 1.
• Iterate from 1 to the value of k using the for loop.
• Multiply the iterator value to the above-initialized gvn_multiplr and store it in the same variable gvn_multiplr.
• Add the above-obtained value of gvn_multiplr to the resltsum outside the for loop.
• Store it in the same variable resltsum.
• Increment the value of k by 1 outside the for loop.
• Print the resltsum value which is the result of the series till the given Number N.
• The Exit of the Program.

Below is the implementation:

# Give the number N as user input using the int(input()) function and
# store it in a variable.
gvn_numb = int(input("Enter some Random Number = "))
# Take a variable say resltsum which gives the sum of the given series till N and
# initialize its value to 0.
resltsum = 0
# Take another variable say k and initialize its value with 1.
k = 1
# Loop until the value of k is less than or equal to the given number using the while loop.
while(k <= gvn_numb):
# Inside the loop take a variable say gvn_multiplr and initialize its value with 1.
gvn_multiplr = 1
# Iterate from 1 to the value of k using the for loop.
for itr in range(1, k+1):
# Multiply the iterator value to the above-initialized gvn_multiplr and store it in the same
# variable gvn_multiplr.
gvn_multiplr *= itr
# Add the above-obtained value of gvn_multiplr to the resltsum outside the for loop.
# Store it in the same variable resltsum.
resltsum += gvn_multiplr
# Increment the value of k by 1 outside the for loop.
k += 1
# Print the resltsum value which is the result of the series till the given Number N.
print(
"The total sum of the series till the given number {", gvn_numb, "} = ", resltsum)


Output:

Enter some Random Number = 7
The total sum of the series till the given number { 7 } = 5913

If you wanna write simple python programs as a part of your coding practice refer to numerous Simple Python Program Examples existing and learn the approach used.