What are permutation and Combination?

In English, we make use of the word “combination” without thinking if the order is important. Let’s take a simple instance.

The fruit salad is a combination of grapes, bananas, and apples. The order of fruits in the salad does not matter because it is the same fruit salad.

But, let us assume that, the combination of a key is 475. You need to take care of the order, since the other combinations like 457, 574, or others won’t work. Only the combination of 4 – 7 – 5 can unlock.

Hence, to be precise;

• When the order does not have much impact, it is said to be a combination.
• When the order does have an impact, it is said to be a permutation.