If the product of n matrices [[1,n][0...

If the product of n matrices `[[1,n][0, 1] [[1, 2],[ 0 , 1]] [[1 , 3],[ 0, 1]][[1, n],[ 0 , 1]]` is equal to the matrix `[[1, 378], [0 , 1]]` then the value of n is equal to

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