Let H i {\displaystyle H_{i}} be the hypothesis that there are i {\displaystyle i} non-black ravens, and suppose that the hypotheses H 1 , H 2 , . . . , H r {\displaystyle H_{1},H_{2},...,H_{r}} are initially equiprobable.
Asumsikan bahwa H i {\displaystyle H_{i}} adalah hipotesis dimana i {\displaystyle i} gagak non-hitam, dan anggaplah bahwa hipotesis H 1 , H 2 , . . . , H r {\displaystyle H_{1},H_{2},...,H_{r}} awalnya memiliki probabilitas setara.