some examples of symbols for permuation groups are: Sn Cn An These are the symmetric group, the cyclic group and the alternating group of order n. (Alternating group is order n!/2, n>2) One other is the Dihedral group Dn of order 2n.
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N!/N
Permutation is when order matters, combination is when order does not matter
They are concepts used in probability theory.
Because a permutation includes all the different arrangements or order of the items in a set. In a combination the order doesn't matter or count.
Symbols are small, well, symbols that are ON the map. The Key is off to the side, and tells you what the symbols mean.