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How to calculate total combinations for AABB and ABBB sets? Although both belong to a much broad combination of N=2 and n=4 (AAAA, ABBA, BBBB ), where order matters and repetition is allowed, both can be rearranged in different ways: First one: AABB, BBAA,
The commutator of two matrices - Mathematics Stack Exchange The commutator [X, Y] of two matrices is defined by the equation $$\begin {align} [X, Y] = XY − YX \end {align}$$ Two anti-commuting matrices A and B satisfy $$\begin {align} A^2=I \qu
How many words of length $n$ can be generated from an alphabet of $k . . . This is kind of late, but the correct approach would be to use binomial coefficients For instance, here we have words of length 4 and we're looking for a binary chain with 2 "1"s and 2 "0"s which would translate to C (4,2), which is 6 And with the number of different pairs of symbols you'd have k x (k-1) different combinations So the answer would be k x (k-1) x C (n,r) where k is your