### FAQ?

#### First things first, no coin human or breeze is fair. Anything can happen. There are two choices, heads and tails. We like one, heads. Tails is a no... 0Read more

#### Are you asking the odds of getting heads just one time in fifty flips? That would be very near 100%. The only way that you get no heads is to get f... 0Read more

#### There’s only one way not to get any heads in 50 flips of a coin and that’s to get 50 tails in a row (unlikely, but not impossible). The probability... 0Read more

#### There’s an easy way to tell if you are having an impact or not. Select a particular side and a particular coin. Let’s say a US \$0.25 coin, commonly... 502Read more

#### tldr answer: 7.96% How we get there: For one coin flip it is simple: 50%. (1/2) We can remove the other 50% - they have already failed. When we fli... 6Read more

#### You are making a logical mistake that is quite common and has to do with not appreciating how fractions behave in limits. I’ll exaggerate the point... 17Read more

#### The total number of ways to flip 400 coins is ${2}^{400}$. So we need to count the number of ways that we’ll get at least 100 heads and... 8Read more

#### Jonathan's answer is elegant and correct. Here is another way to find the answer. There are 2x2x2x2=16 possible combinations of Hs and Ts given 4 c... 6Read more

#### $\frac{\binom{100}{50}}{2^{100}}=\frac{100!}{(50!)^2\cdot 2^{100}}\approx 0.07958924$ But here’s a fun party trick. If you want to estim... 80Read more

#### There are 8 equally likely possible outcomes: 1. HHH - no 2. HHT - no 3. HTH - no 4. HTT - yes 5. THH - no 6. THT - yes 7. TTH - yes 8. TTT - no So... 4Read more

#### P (h%3E25)=p(h%3E=26)= 1-p(h%3C=26) Assume the situation is approximately normal u= np =50(1/2)=25 , s=√(npq) = √( 50)(.5)(.5) =√12.5 z=(x-u)/s = (... 0Read more

#### Here’s a nice result that’s worth remembering. If you flip a fair coin $2n$ times, then the probability of getting exactly $n[/math... 9Read more #### Let h and t be the count of heads and the count of tails, respectively. Note that because of symmetry: [math]P(h %3E t) = P(h %3C t)$ Now we... 3Read more

#### The sample space of this distribution has 51 elements (0 heads to 50 heads, inclusive) and 25 heads lies exactly in the middle of this distribution... 1Read more

#### In more layman’s terms each coin flip has exactly 0.5 (or 50%) chance either way. With 50 flips its still true, for each individual flip, regardles... 2Read more

#### Flipping a coin and ending with heads is .5 (50%). [one time] Flipping the same coin three times and ending with three heads is .5 x .5 x .5 = .125... 5Read more

#### It’s not going to happen. Every time I flip a coin, it comes up heads. Been that way since 1990 and I’m not going to stop just for a Quora question... 5Read more

#### 50% to the ninth power. When the events are independent, you can just multiply all of the probabilities together. 5Read more

#### There are four equally likely outcomes: HH, HT, TH and TT. Of these, two match the criterion given (“one will come up heads and the other tails”).... 12Read more

#### There are 8 equally likely possible outcomes: 1. HHH - no 2. HHT - no 3. HTH - no 4. HTT - yes 5. THH - no 6. THT - yes 7. TTH - yes 8. TTT - no So... 4Read more
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