1. ## Simple Probability Question

Hi. I have a simple probability question:

Not counting the greens, what are the odds of getting 19 of the same color in a row in roulette?

I'm assuming the answer would be 0.5 to the 19th power.

I tried to do this in Excel, but it would not calculate it.

I'm thinking the answer is something like 1 in 500,000?

Please let me know if this is close.

Thanks! You guys are awesome!

3. ## Re: Simple Probability Question

My version of Excel gave me
1.90735E-06

I didn't know Google did exponentiation. . .

4. ## Re: Simple Probability Question

Yes, I got "E-06" as well, but I was hoping to get the actual figure.

Thanks all! This is a great forum.

5. ## Re: Simple Probability Question

What do you mean by the 'actual figure'? Like the actual fraction? For that you just need to figure out 2^19 = 524288 so the fraction is 1/524288 exactly.

6. ## Re: Simple Probability Question

I'm an amateur but it's my sense that carrying three significant figures is probably accurate enough for most probability calcs.

7. ## Re: Simple Probability Question

Be careful that it could be 19 red in a row or 19 black in a row.

8. ## Re: Simple Probability Question

Ha. That's true, I got caught up in the actual calculation that I didn't really think about that stuff. Oh well. Plus it's not that much more difficult to find the probability when accounting for the greens so I don't really seem why we're ignoring them.

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