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If a coin is flipped 3 times, and 2 out of those three times it comes up heads, what is the probability the second time it is flipped it comes up heads?

2007-11-15 05:59:20 · 6 answers · asked by MrV 2 in Science & Mathematics Mathematics

6 answers

Not as simple as 50/50. True each flip is 50/50 but the probability factor changes as the continuation of one choice progresses. for example, If you have 4 coins and you flip them you actually have 16 possible combinations 4 heads/4tails/3H+1T etc etc so the probability of getting 4 heads is 1 in 16. On the same level the combinations for 3 coins is 4 (HHH, HHT, HTT & TTT) so the probability of getting 3 Heads is .........1 in 4
Suggest you search for "Pascal's Triange" It's a fairly simple method that shows how to calculate the odds.

2007-11-15 06:22:34 · answer #1 · answered by Raysalittlehell 2 · 0 1

1/2 is the probability that it comes up heads the second time... but if you want the probability of it coming up heads the, first time and the second time then its:

1/2 x 1/2= 1/4

2007-11-15 14:03:11 · answer #2 · answered by curiousperson 2 · 1 3

2/3 because two times heads, three flips, so all cases it is 2/3.

2007-11-15 14:02:36 · answer #3 · answered by Matt 3 · 1 2

2/3. Just write out the possibilities: HHT, HTH, THH. In 2/3 of them, there's an H in spot 2.

2007-11-15 14:03:48 · answer #4 · answered by JP 3 · 2 2

2 out of the three tosses was heads, therefore the 2nd toss (or any one of the three tosses for that matter) had a 2 out of three chance of being heads.

ANS: 2 out of 3 ... or 1:1.5

2007-11-15 14:08:59 · answer #5 · answered by David F 5 · 1 2

50/50

2007-11-15 14:02:23 · answer #6 · answered by Fred F 7 · 1 3

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