1 4 5 2x )= 13 July 8, 2019 16 32 64 128 4 x 3 5 2x 1 13 2 x 1 5 2x 13 4 3x 4 5x 2 1 6x 5 2x 13 3x 1 4 2x 1 5 7x 13 20