3 *( 2 6 )* 21 7 July 8, 2019 16 32 64 128 1 3 3х 6 )- 2 7 7х 21 )= 9 1 3 3x 6 )- 2 7 7x 21 )= 9 1 3 3x 6 )- 2 7 7x 21 1 3 3х 6 )- 2 7 7х 21 3 4x 7 2 21 6
