for Roulette

which of the 3 ways are the best in ur opinions?

can share?

1)I remember when I first go genting casino, I use this formula, with roulette I walk around the table when I saw 3 result come out which is in same 12set I buy other 2 12set I buy each 25 mean win 25 lose 50.
2)I go casino again same as (1) but I double up bet when I hit, example I buy each 50 I get return 150 next hand I bet each 75, if hit I won 125, fail lose 100.
3)Again I go as (1) but this time I double up when lose, like 25 each lose I bet 75 each lose again I bet 225 each, if hit I won 25 nia if lose 3 in row I lose 650.
 

Thks!