MATH PROBLEM

Math problem

Theory

Permutations and combination of names reflects the mathematicians for certain groups of objects or symbols. Permutations and arrangements for the collection of objects, for example, is (a b c) and (a c b) and (b a c), the three permutations of the set of symbols a, b, c.

The combinations are those groups that include the same things regardless of the arrangement, the groups were (a b c) and (a c b) and (b a c) all represent the same combinations.

Combination: nCr = nPr / (r!) = n! / (n - r)!r!

Permutation: nPr = n! / (n - ...