ritwik06 said:
The main difference between permutation and combination is the order of arrangement. Permutation is the arrangement of objects in a specific order, while combination is the selection of objects without considering the order.
You should use permutation when the order of arrangement matters, such as finding the number of ways to arrange a set of letters or numbers. Combination should be used when the order does not matter, such as selecting a committee of people from a group.
The formula for calculating permutations is n!/(n-r)!, where n represents the total number of objects and r represents the number of objects being arranged.
The formula for calculating combinations is n!/(r!(n-r)!), where n represents the total number of objects and r represents the number of objects being selected.
Permutation is often used in lottery or gambling games, where the order of numbers matters. Combination is used in situations like selecting a team for a sports game, where the order of players does not affect the outcome.