Final answer:
To compute the sum Σ 8 -1 ! using a loop, you can iterate from 8 down to 1, calculate the factorial of each number, and add it to the sum.
Step-by-step explanation:
To compute the sum of Σ 8 - 1 ! using a loop, we can start with a variable, let's call it 'sum', initialized to 0. Then, we can use a loop to iterate from 8 down to 1. In each iteration, we subtract 1 from the current number and calculate its factorial. We add the factorial to the 'sum' variable. Finally, when the loop finishes, the 'sum' variable will contain the desired sum.
Here's an example in Python:
sum = 0
for i in range(8, 0, -1):
factorial = 1
for j in range(1, i+1):
factorial *= j
sum += factorial
print(sum)