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Actual interview brainteaser at a top flight shop
- Thread starter sjfan
- Start date
To clarify: you double you bet if you win. So, if you bet $50, and you win, you get back $100. If you lose, you get back nothing.
Another way to look at it is, if you have $100 and you bet $50, your cash will be $150 you win and $50 if you lose.
I keep switching between the two forms of notation. Maybe that's why it's confusing to a few people.
Another way to look at it is, if you have $100 and you bet $50, your cash will be $150 you win and $50 if you lose.
I keep switching between the two forms of notation. Maybe that's why it's confusing to a few people.
Quote from AyeYo:
That makes all the difference in the world. I think that's why this is so confusing. I caught that on page 2 when he said that with $25 in hand and a bet of $25 you end up with $75. I thought I was just going crazy.
I'm not sure the betting math is right here. In round two, you have $50 on hand. You bet $25. You win. You back back $50. But since you paid $25 to make this bet, your total cash on hand is $75, not $100.
Quote from Bogwaluth:
That's why I added the part above. On your t,h,t,h,h scenario you get
Bet 1 - 50 / New Bank Roll - 50
Bet 2 - 25 / New Bank Roll - 100
Bet 3 - 50 / New Bank Roll -50
Bet 4 - 25 / New Bank Roll - 100
Now use the exception to the strategy above and
Bet 5 100 / New Bank Roll - 200
First true break-thru insight!: you'd need to have something so that if you have lost the first two, you can still win.
the second point is some what off the mark and the third point completely. But the first point you made is big conceptual step.
the second point is some what off the mark and the third point completely. But the first point you made is big conceptual step.
Quote from gaj:
you'd need to have something so that if you have lost the first two, you can still win.
so in this case, you'd have X (first round) +2x (second) +4X (third round) = 200.
so your max drawdown can be to about 29.
Sorry if I didn't make that clear.
Essentially, the payoff of each bet is actuarially fair to the probability of those payoffs. So HINT #3 this should rule out both simple martingale and anti-martingale strategies (but not all complex strategies that are either martingale or anti-martingale like)
Essentially, the payoff of each bet is actuarially fair to the probability of those payoffs. So HINT #3 this should rule out both simple martingale and anti-martingale strategies (but not all complex strategies that are either martingale or anti-martingale like)
Quote from Bogwaluth:
So the R:R is 1:1 Bet $50 to Win 50$
I was using bet $50 to win $100.
Ok my last guess. 37.50 37.50 If you win first 2 flips or lose first 2 flips continue with 25 50 100. If you win ONLY 1 of first 2 flips, continue with 50 50 100.