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ok in the meantime I will read up on recurrence relation

Thanks Bobby can you teach me how you did this?

You would keep adjusting your bankroll after each result so there would be no way to go broke.

**nflguy**- Replies: 14

Say you went to the race track every day and bet on 3 horse races. You are very good at what you do and are able to pick the correct horse 55% of the time. The amount you wager on each race is 5% of your current bankroll which you calculate after each race. Each time you win a race by picking the correct horse you add 5% to your bankroll. Each time you are incorrect you lose 5.5% of your bankroll.

The question is if you have a starting bankroll of $5000 how long would it take to turn that intial $5000 into 1 million dollars and how do I figure that out.

Second question is do the order of wins and lossess matter.

nflguy

No programmer but I know HTML and dabble in sql server and I catch on quick to things especially topics that intrigue me. I am the type of person that will use the excel functions for efficiency but I want to be able to know how to do it just for the knowledge. Hell I was playing around taking quizzes last night on your site just for the fun on it.

I was always good at math in school but I dropped out before my junior year to start working so I am pretty sure I didn't learn this. I kick myself now because the things I am interested in now math, science, history are all things I didn't pay much attention in school. This may sound silly to some but I actually look forward to my kids bringing home school work asking for help because I want to relearn everything. Anyway I really appreciate the help and the thorough explanation.

BTW I did find the formula on excel for those future readers that want to check their work in excel

=BINOMDIST(2,4,0.55, FALSE)

2 is successes

4 is trials

.55 is probability

true or false is for if probability is cumulative.

yes understand it all

got it

start right there

yes I understand so far

bobbym wrote:

Where n is the number of heads.

Is this something I can do on a piece of paper by hand or is there a page on the website that explains it?

Yes I know that Bobby, I am asking how did you figure that out? What is the formula to do so?

**nflguy**- Replies: 22

Lets say I have a magical coin that lands on heads 55% of the time and tails the other 45% of the time. How could I figure out how often out of 4 flips it will land on heads 0,1,2,3,4 times?

I have figured out that

4 heads is 9.15% (.55 * .55 * .55 * .55)

0 heads is 4.10% (.45 * .45 * .45 * .45)

I know that the answer is for 3 heads is 29.95%, 1 heads is 20.05% and 2 heads is 36.75%.

The problem is I can't figure out the formula for those. I was able to get the 3 heads using (0.55*0.55*0.55*0.45)*4 and the 1 heads by using (0.55*0.45*0.45*0.45)*4 but I dont even know if that is the right way to do it, and what the reason is that I have to use * 4 for those but the first two. I still can't figure out the 2 heads formula I just subtracted the other values to get the number.

I would like to be able to do this using other values and numbers of flips so the explanation and formula to do this one would greatly help me out.

Tom

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