Find the Missing Number in a List | Python Interview Question Explained Step by Step #coding

Welcome back to @ProgrammerChandra 👋

In this video, we’ll learn how to find the missing number in a list using Python, step by step.
This is one of the most common Python interview questions — and in this video, we’ll solve it using a simple mathematical formula and the sum() function.

We’ll cover:
✅ Understanding the problem
✅ Using the formula n * (n + 1) / 2
✅ Calculating the expected and actual sum
✅ Finding the missing number efficiently

By the end of this video, you’ll understand how to solve this logically and cleanly in just a few lines of Python code.

💻 Code Used in This Video:
nums = [1, 2, 3, 5]
n = len(nums) + 1
total = n * (n + 1) // 2
missing = total - sum(nums)
print("Missing number is:", missing)
Output:

Missing number is: 4

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Видео Find the Missing Number in a List | Python Interview Question Explained Step by Step #coding канала ProgrammerChandra