 In such instances, the truth appears as the result of reasoning from inexact or partial knowledge in which the sampled answers are mapped on a spectrum.Both degrees of truth and probabilities range between 0 and 1 and hence may seem similar at first, but fuzzy logic uses degrees of truth as a mathematical model of "vagueness", while probability is a mathematical model of "ignorance".A basic application might characterize various sub-ranges of a continuous variable.