1-teorema. Ikkita birgalikda bolmagan hodisadan istalgan birining roy berish ehtimoli bu
hodisalar ehtimollarining yigindisiga teng: P(A+B) = P (A) + P (B)
2-teorema. Ikkita erkli hodisalarning birgalikda roy berish ehtimoli, bu hodisalar ehtimollarini
kopaytirilganligiga teng:
P(AB)=P(A) P(B)
3-teorema. Ikkita bogliq hodisalarning birgalikda roy berish ehtimolini ulardanehtimolini
ikkinchisining shrtli ehtimoliga kopaytirilganligiga teng.
P(AB)=P(A) P(B/A) = P(B) P(A/B)
4-teorema. Ikkita birgalikda bolgan hodisadan kamida bittasining roy berish ehtimoli
bu hodisalarning ehtimollari yigindisidan ularning birgalikda roy berish ehtimolini
ayrilganligiga teng:
P(A+B) = P(A) + P(B) P(AB)
5-teorema. Birgalikda bog;liq bolmagan A1,A2,An hodisalaridan kamida bittasining roy
berishidan iborat A hodisaning ehtimoli 1dan A1,A2,An qarrama qarshi hodisalar ehtimollari
kopytmasining ayirmasiga teng: P(A) = 1-P(A1)P(A2)P(An)