Overview
Combination is a selection of items in a set such that the order of selection does not matter.
Permutation is arranging items in a set into some order or sequence. The order does matter here.
Example 1
How many combinations are there to select five numbers out of 0 to 9?
Steps:
10 nCr 5 =
Result: 252
Example 2
How many bets are there in a lottery to randomly select five numbers out of 0 to 9 given that each number is unique?
Steps:
10 nPr 5 =
Result: 30,240
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