You cannot forecast the next winning number on roulette from previous spins. Unless something is funky.
The house edge in roulette, as you say, comes from the payout structure. There are 37 numbers and you get 35 plus your stake for a winning chip on a straight up. This gives the casino an edge of 2.7%. The inside bets are scaled so that shoud you wish to cover two numbers you can put two chips on a split and receive (2x17 + your 2 chip stake) giving you the same 36 chips you would have if you put a chip straight up on both numbers. The difference is the outside even money propositions. Here you only lose half your stake when 0 comes in. This exactly halves the casino's 1 number advantage giving a house edge of 1.35%.
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Consider the three pairs of even- money bets Red/Black-High/LOW-Odd/Even.Taking one from each pair involves 8 trebles ,each being a 7/1 shot.Classing them as ROBES (Red Odd/Black/Even) and BORES(BlackOdd/Red Even ) the Robes each have 5 numbers while the Bores have four. So, if we bet only the Bores BUT INSIDE ON THE LAYOUT with four chips WE GET ODDS OF 8/1- which means that we get 8/1 for a 7/1 shot !?
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I have to be honest and say i didnt understand that but i can still confidently say that if you are talking about betting the even money outside propositions
inside on the layout you are in fact doubling the house edge not decreasing it.
1.35% on the outside, 2.7% on the inside. As to when to bet, thats easy, when you have the money and can comfortably afford to lose it.
