Hat puzzle 5 prisoners answer correctly and 5 do not. Note that the prisoners cannot find a strategy guaranteeing the release of more than 5 prisoners. Indeed, for a single prisoner, there are as many distributions of hat colors where he says the correct answer than there are where he does not. Hence, there are as many distributions of hat colors where 6 or more prisoners say the correct answer than there are where 4 or fewer do so. In this variant, a countably infinite number of prisoners, each with an unknown and randomly assigned red or blue hat line up single
Gallon works out at approximately (). The metric definition of exactly cubic decimetres (also after the litre was redefined in 1964, ≈ ) was adopted shortly afterwards in Canada, but from 1976 the conventional value of was used in the United Kingdom until the Canadian convention was adopted in 1985. Historically, gallons of various sizes were used in many parts of Western Europe. In these localities, it has been replaced as the unit of capacity by the litre. Gallon The gallon () is a unit of measurement for volume and fluid capacity in both the US customary units and the British