ba^T = 1+1+1 = 3A^n = a^T b a^T b a^T b......a^T b a^T b= a^T (ba^T) (ba^T) (b......a^T) (ba^T) b= a^T 3^(n-1) b = 3^(n-1) a^T bA^n = 3^(n-1)*[1 1/2 1/3][2 1 2/3][3 3/2 1]