Gebeurtenisse A, B en C word gedefinieer op ‘n steekproefruimte S. Die gebeurtenisse is onderling uitsluitend en hulle vereniging is S. Verder is gebeurtenis B twee keer meer waarskynlik as gebeurtenis A, en gebeurtenis C is twee keer meer waarskynlik as gebeurtenis B. Die waarskynlikheid van elk van die drie gebeurtenisse is onderskeidelik / Events A, B, and C are defined on a sample space S. The events are mutually exclusive and their union is S. Furthermore, event B is twice as likely to occur as event A, and event C is twice as likely to occur as event B. The probability of each of the three events are, respectively