Math and Arithmetic
Statistics
Probability

# What is the chance that that 2 flipped coins both come up heads?

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The probability that 2 flipped coins both come up heads is 0.52 or 0.25

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## Related Questions The probability that both coins are heads is the probability of one coin landing heads multiplied by the probability of the second coin landing heads: (.5) * (.5) = .25 or (1/2) * (1/2) = 1/4 The sample space is HH, HT, TH, HH. Since the HH combination can occur once out of four times, the probability that if a coin is flipped twice the probability that both will be heads is 1/4 or 0.25.  75% The chance of not having a tails but a heads on both coins is (1/2)2 or 25%, so the chance of actually having a tails on either coin is 3/4, or as a percentage 75% . The probability of 2 coins both landing on heads or both landing on tails is 1/2 because there are 4 possible outcomes. Head, head. Head, tails. Tails, tails. Tails, heads. Tails, heads is different from heads, tails for reasons I am unsure of.  Half the time they will be the same, half the time they will be different. Half of the time that they're the same they will be heads, half the time they are the same they will be tails. It's your homework, YOU figure it out. The way I figure it. There are four options: 1) heads / heads 2) heads / tails 3) tails / heads 4) tails / tails By process of chance, one out of four times both coins will be heads/heads. Therefore 780/4 = 195 times.  1/4 you see if you flip two coins there's a better chance you'll get a head and a tail then any thing else. 2/4 you'll get a head and a tail, 1/4 you'll get two heads and 1/4 you'll get two tails. If both tosses are fair, the probability of that outcome is one in four. The correct answer is 1/2. The first two flips do not affect the likelihood that the third flip will be heads (that is, the coin has no "memory" of the previous flips). If you flipped it 100 times and it came up heads each time, the probability of heads on the 101st try would still be 1/2. (Although, if you flipped it 100 times and it came up heads all 100 times - the odds of which are 2^100, or roughly 1 in 1,267,650,000,000,000,000,000,000,000,000 - you should begin to wonder about whether it's a fair coin!). If you were instead asking "What is the probability of flipping a coin three times and having it land on "heads" all three times, then the answer is 1/8. Potentially inclusive events are events that can happen simultaneously. For example, events A and B can occur at the same time. When these events do cannot occur simultaneously, then then are called Mutually exclusive (opposite). Potentially Inclusive: If A is heads of Coin 1 and B is heads of Coin 2, then tossing of both the coins is potentially inclusive since you can get heads on both the coins same time. Mutually exclusive: If A is heads and B is tails , then tossing of a coin is mutually exclusive since you cannot get heads and tails at the same time. You either get heads or tails. The probability is 0.25.Look at it this way--if you toss a coin twice, there are four equally-probable outcomes:tails, tailstails, headsheads, tailsheads, headsSo the probability of heads twice in a row is one in four, or 25%.the chance of tossing heads is 1/2 (50%) The chance of tossing the next heads is 1/2 (50%) 1/2 x 1/2 = 1/4 (25%) A coin with heads or tails on both sides are novelty coins manufactured by individuals or companies. They have no numismatic value although some persons collect them and the value is determined by the buyer and the seller of each coin. I assume you mean what's the chance of at least two heads showing when three fair coins are tossed. There are 8 possible outcomes as each coin can either be head or tails. For 3 heads, all 3 coins must show a head &rarr; 1 success For 2 heads, one coin will be a Tail; each coin could be a tail in turn &rarr; 3 successes &rarr; Pr = (1+3)/8 = 4/8 = 1/2 If you are wanting the probability that the first TWO specific coins are heads and the last, third, coin is either, then: Pr(head) = 1/2 &rarr; Pr(1st 2 heads, 3rd anything) = 1/2 &times; 1/2 &times; 1 = 1/4 Depending on the specifications, it could be 1/4 (25%) or 1/2 (50%). If you specify that Coin A must be heads and Coin B is tails, then it is 25%: Because you have 1/2 chance for each coin, you multiply these chances together : (1/2) x (1/2) = 1/4However if you just want 'one of the coins' to be heads, and 'the other coin' to be tails, then it is 1/2 (50%). Here are the 4 possible outcomes:Both A & B are headsBoth A & B are tailsA is heads, B is tailsA is tails, B is heads.So for outcomes # 3 & 4 meets our criteria. This is 2 out of the 4 possible, or 2/4 = 1/2 or 50%. Here are two ways: You could make a table: . |H | T --------- H| 1 0 T| 0 0 The row across the top is the first toss. The column is the second toss. The one with both Heads is indicated with a 1. There is 1 chance out of the 4 possible outcomes, so 1/4 = 0.25 Mathematically: Chance of first coin Heads = 0.5, chance of 2nd coin heads = 0.5; then multiply the two probabilities together, since they both have to happen: (0.5)*(0.5) = 0.25 There is a 1/6 chance of rolling a 4 on a fair die, and a 1/2 chance of a fair coin landing heads up. Multiply 1/6 X 1/2. The probability of both happening is 1/12. Generally, the larger the sample the more reliable the results. Example: If you flipped a coin twice and got heads both times you could say the coined is biased towards heads. However, if you repeat the experiment 100 times your results will be a lot more reliable. Zero. Please search this site for the word DOUBLE. You'll find hundreds of similar questions about these trick "coins". its a tie they both have freakishly large heads,.(: 2 up is a game played in Australia on Anzac day. It is illegal every other day of the year except for April 25th. The game involves 2 coins being placed on a wooden rod, one face up the other face down and the players bet whether the coins when flipped, will land both face up, both face down or one of each. 1 out of 4, or 25% ChanceHHHHHTHTHHTTTHHTHTTTHTTTThere is only 3 coins, with 2 possible sides that they could land on, 8 possible outcomes, but with HHH and TTT both considered as the same side, that means there is 2 different out comes that are on the same side. There for, 2 out of 8, meaning 1 out of 4. We need to calculate two things:How many possible possible series of 10 coin flips are there? As we flip 10 times and each time we can have either heads or tails we have 2 by the power of ten possibilities, or a total of 1024 unique possible series.Now, how many of those series have exactly five heads and five tails? Lets assume we have ten "pre filipped" coins at hand - 5 tails and 5 heads. How many possible combinations are there. Well, if they were all different, you would have 10! (10 factorial = 10*9*8*7*6*5*4*3*2*1) possibilities.How ever, the 5 heads are identical and so are the 5 tails, so if I interchange the locations of two coins that are both heads for example I still get the exact same series. There are 5! possible heads combinations, and 5! tails combinations.Thus, the total number of unique combinations is 10!/(5!*5!) which happens to be 252.So, out of 1024 possible series, 252 contain exactly 5 heads.The probability thus is 252/1024=0.24609375 (roughly 25%) they both are big bone headsThey are both from Africa.

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