Tony Hecker wrote on Sun, May 25, 2008 01:47 PM UTC:
'Actually the chance for twice the same flip in a row is 1/2.'
H.G. is correct here.
- The probability of two heads in a row is 1/4.
- The probability of two tails in a row is 1/4.
- The probability of two same flips in a row is the sum of these two
outcomes: 1/4 + 1/4 = 1/2.
Another way to think about it:
With two coin flips, there are 4 equally likely outcomes: HH, HT, TH, TT.
In 2 of the 4 (equally likely) outcomes, the same flip result occurs twice
in a row.
