Changes

:<math>\frac {n!}{n_1! n_2! \cdot \cdot \cdot n_r!}</math>, where ''n'' is the total number of objects, and ''n₁'' through ''n_r'' are the total number of each type of objects within the group.

:<math>\frac {n!}{n_1! n_2! \cdot \cdot \cdot n_r!}</math>, where ''n'' is the total number of objects, and ''n₁'' through ''n_r'' are the total number of each type of objects within the group.

For example, the letters ''p'' and ''e'' in the word "pepper" are indistinguishable from one another. There are 6 total letters, which are comprised of 3 <i>p</i>'s, 2 <i>e</i>'s, and 1 ''r''. The total number of permutations would thus be 6! / (3 ! 2! 1!), or 60.

For example, the letters ''p'' and ''e'' in the word "pepper" are indistinguishable from one another. There are 6 total letters, which are comprised of 3 ''p'''s, 2 ''e'''s, and 1 ''r''. The total number of permutations would thus be 6! / (3 ! 2! 1!), or 60.

===Combinations===

===Combinations===

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[[category: mathematics]]

[[Category:Mathematics]]