How many character combinations with RBF 5 characters long?

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fanhypermax2018-03-06 11:10:39

Mathematics

fanhypermax, 2018-03-06 11:10:39

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2 answer(s)

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Roman Kitaev, 2018-03-06
@deliro

Remember school combinatorics and count

X

xmoonlight, 2018-03-06
@xmoonlight

3*3^(5-3)=27
3 positions of all possible permutations,
3^(5-3) variants of the current permutation,

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