# How many flips do you need to see 3 heads in a row?

### Table of Contents

- How many flips do you need to see 3 heads in a row?
- How many ways can you get 3 heads?
- What is the probability of flipping heads 3 times?
- What is the probability of exactly 3 heads?
- How many flips is 2 heads in a row?
- What are the odds of flipping 20 heads in a row?
- What is the probability of flipping a coin 3 times and getting heads all 3 times?
- What is the probability of flipping a coin and getting 3 heads and 3 tails on six flips?
- How many flips do you need to get two heads?
- What is the expected number of coin flips to get two heads?
- What's the minimum number of flips to make a string?
- What is the probability of a heads flip?

### How many flips do you need to see 3 heads in a row?

So it takes **14 tosses** to get 3 heads in a row, then 30 tosses to get 4 heads in a row, and this grows exponentially in the number of consecutive tosses.

### How many ways can you get 3 heads?

Total of ways = 64, with 20 possible ways to toss exactly 3H and 20+15+6+1 = **42 ways** to toss at least 3 heads. Probability of tossing at least 3H = 42/64 =21/32 = 0.65625 ~ 65.6%.

### What is the probability of flipping heads 3 times?

The probability of getting 3 heads when you toss a "fair" coin three times is (as others have said) **1 in 8**, or 12.5%. However, that isn't the question you asked. If you toss a coin exactly three times, there are 8 equally likely outcomes, and only one of them contains 3 consecutive heads. So the probability is 1 in 8.

### What is the probability of exactly 3 heads?

1/4
N=3: To get 3 heads, means that one gets only one tail. This tail can be either the 1st coin, the 2nd coin, the 3rd, or the 4th coin. Thus there are only 4 outcomes which have three heads. The probability is **4/16 = 1/4**.

### How many flips is 2 heads in a row?

In other words, the first tails makes all the previous **tosses** “wasted” and that increases the conditional expected time by that **many tosses**. Therefore, x = 6. Thus, the expected number of coin **flips** for getting **two** consecutive **heads** is 6.

### What are the odds of flipping 20 heads in a row?

12
If a fair coin is flipped 21 times, the probability of 21 heads is 1 in 2,097,152. The probability of flipping a head after having already flipped 20 heads in a row is **12**.

### What is the probability of flipping a coin 3 times and getting heads all 3 times?

**0.13** is the probability of getting 3 Heads in 3 tosses.

### What is the probability of flipping a coin and getting 3 heads and 3 tails on six flips?

**0.66** is the probability of getting 3 Heads in 6 tosses.

### How many flips do you need to get two heads?

Therefore the total number of flips now required will be x+2 and the probability of this event is 1/4. The last case is, if we get two consecutive heads on two consecutive flips of the coin respectively. The probability of this event is 1/4 and the total number of flips required will be 2.

### What is the expected number of coin flips to get two heads?

The probability of this event is 1/4 and the total number of flips required will be 2. Framing the above three cases in the form of equations and adding we will get: Therefore, x = 6. Thus, the expected number of coin flips for getting two consecutive heads is 6. Check out this Author's contributed articles.

### What's the minimum number of flips to make a string?

Input : str = “001” Output : 1 Minimum number of flips required = 1 We can flip 1st bit from 0 to 1 Input : str = “0001010111” Output : 2 Minimum number of flips required = 2 We can flip 2nd bit from 0 to 1 and 9th bit from 1 to 0 to make alternate string “0101010101”.

### What is the probability of a heads flip?

If the first flip is a heads and second flip is also heads, then we are done. The probability of this event is 1/4 and the total number of flips required is 2. Solving, we get x = 6.