Python Coding Challenge - Question with Answer (01221125)

 

Explanation:

1. Initialize the List

nums = [9, 8, 7, 6]

A list named nums is created.

Value: [9, 8, 7, 6].

2. Initialize the Sum Variable

s = 0

A variable s is created to store the running total.

Initial value: 0.

3. Start the Loop

for i in range(1, len(nums), 2):

range(1, len(nums), 2) generates numbers starting at 1, increasing by 2.

For nums of length 4, this produces:

i = 1, 3

So the loop will run two times.

4. Loop Iteration Details

Iteration 1 (i = 1)

s += nums[i-1] - nums[i]

nums[i-1] → nums[0] → 9

nums[i] → nums[1] → 8

Calculation: 9 - 8 = 1

Update s:

s = 0 + 1 = 1

Iteration 2 (i = 3)

s += nums[i-1] - nums[i]

nums[i-1] → nums[2] → 7

nums[i] → nums[3] → 6

Calculation: 7 - 6 = 1

Update s:

s = 1 + 1 = 2

5. Final Output

print(s)

The final value of s is 2.

Output: 2

Final Answer: 2

Probability and Statistics using Python