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Calculating odds

  1. Aug 27, 2007 #1
    the chance of a coin toss coming up heads is 1 in 2. i assume that the chance of it coming up heads twice in a row is 1 in 4; three times consecutively 1 in 8; 4 times 1 in 16; 5 times 1 in 32, etc... is this accurate? if not, how would that be calculated?

    Last edited: Aug 27, 2007
  2. jcsd
  3. Aug 27, 2007 #2
    That's right. For the first few cases you can write down the outcomes. Such as H T, HH HT TH TT, and so on, count the number of events favourable to the outcome of all tosses showing a head(which is 1 in all cases), and count the total number of outcomes. You will notice that for n tosses, the probability is [itex]\frac{1}{2^n}[/itex].
  4. Aug 27, 2007 #3
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