Board Thread:Questions and Answers/@comment-84.212.227.33-20130126200757/@comment-6247700-20130201005310

Hyper ch wrote: I know what you mean but that's not supported in probability. If you toss a coin twice, then the  probablity of getting head is 0.5. When tossing it again, the probability of getting head is 0.5 again.

So the overall probablity is (0.5 + 0.5) / 2 (tests) = 0.5 actually, the overall probability, if the chance of a head in single toss is 50% goes like this:

at least 1 head in 2 tosses: 0.5 + (0.5 * 0.5) = 0.75 = 75%

given 2 coin tosses you can either have:

Head + Head (25%)

Head + Tail (25%)

Tail + Head (25%)

Tail + Tail (25%)

Total 100%, but chance of at least 1 head is 75%, chance of no heads is 25% and chance of double heads is 25%