R 4 5 3 July 8, 2019 16 32 64 128 R 3 4 5 6 3 = frac r 4 + 5 R 3 r 9 )+ 4 5 R 1 2 3 4 5 6 R 1 2 3 4 5 R 4 3r 5 R 4 5 2r 3 R 5 4 r 2 3 7 R 4 - 5 or 2r 7 3 3 3 4 r 5 3 8 4 5 r )= 3 2r 1 4 r 2 3 5 1 5 r 4 )= 3 R 5 3r 7r 4