pick 7 numbers one unit on each. for three spins. if a win put five units on the seven numbers. if a win 35 units on each number. you lose21 iunits or win945. second system red and the second column. or black and third column.
good luck.
That Red and Black plus respective column you have mentioned is an oldie and is found in many books on roulette... Caution is advised .
N.D.