China Naming Network - Ziwei knowledge - How many permutations and combinations are there for these three numbers?
How many permutations and combinations are there for these three numbers?
Six kinds.
The 975 permutation and combination has six different three digits: 975, 957, 795, 759, 597, 579 * *.
Permutation and combination is the most basic concept of combinatorics. Replacement refers to taking out a specified number of elements from a given number of elements for sorting.