PYTHON PROBLEM 053 · Intermediate

Find a missing number

Find the absent ID among a consecutive class roster.

formula · arrayformulaarray

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests find a missing number. It belongs to the Lists, Tuples, and Nested Data roadmap and uses the formula · array pattern.

Ordered collections, mutation, traversal, copying, matrices, and sequence reasoning.

COMPLETE WORKSPACE

Learn the plan, trace the logic and run the solution

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SKILL TO CARRY FORWARD

Pattern relevance

This exercise strengthens formula · array. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.