MathDB

61

Part of 1984 IMO Longlists

Problems(1)

Odd numbers of heads and a tail in a fair coin.

Source:

10/9/2010
A fair coin is tossed repeatedly until there is a run of an odd number of heads followed by a tail. Determine the expected number of tosses.
probabilityexpected valuecombinatorics unsolvedcombinatorics