Question 927823
Using the {{{10}}} items {{{T}}} , {{{red(Y)}}} , {{{A}}} , {{{G}}} , {{{N}}} , {{{K}}} , {{{green(Y)}}} , {{{Q}}} , {{{I}}} , {{{U}}} ,
you can make {{{10!}}} ordered sequences (permutations) of {{{10}}} characters.
However, if you cannot distinguish {{{red(Y)}}} from {{{green(Y)}}} ,
pairs of sequences where {{{red(Y)}}} and {{{green(Y)}}} appear in different order will look the same,
and you will only see half as many sequences:
{{{10!/2=highlight(1814400)}}}