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for mix column in a yes this is the given our matrix and we have to multiply this input matrix with mix column matrix okay sure so mix column it you have to remember mix column matrix it is very easy so 2 1 1 3 just remember one column then youll find the 4 by 4 matrix well 3 will come here 3 2 will come here 1 1 again 1 will come here and 3 will come here to M 1 will come here I can 1 will go up 1 will come here 3 2 ok so you multiply this 4 by 4 matrix and you find one for back for matrix so I will multiply and show one value suppose this value okay so lets start so using matrix multiplication right to into 95 X or 3 into 65 3 into 65 again X or 1 into F T and 1 into X or 1 into F 3 alright so for this two three one and one we use later we use in form of X 1 will be 1 will be represented as 1 okay and 4 3 1 4 2 2 will be represented as X and 3 will be represented as X plus 1 and you have to remember this so lets start with first part to 295 okay so now for two in 295 lets conv