3 2x 1 )- 2 x 4 )= 19 July 8, 2019 16 32 64 128 3 2x 1 )( x 2 )- 2 3x 2 )( x 4 )=- 19 7x 1 4 1 3 2x 1 x 2 )= 19 3 1 x 2 + 2x 3 + 3x 4 + + 19 x 20 1 2 + 3 4 1 + 2 + 3 + 4 = 10
