1.

`P(AuuB)` ज्ञात कीजिए यदि `2P(A)=P(B)=5/13` और (and) `P(A//B)=2/5`

Answer» सूत्र से `P (A//B)=(P(AnnB))/(P(B))implies2/5=(P(AnnB))/(5//13)`
`implies2/5xx5/13=P(A nn B)" "impliesP(A nn B)=2/13`
अब प्रायिकता के योग प्रमेय से, `P(AuuB)=P(A)+P(B)-P(AnnB)`
`=P(A)+2 P(A)-P(AnnB)=3P(A)-P(AnnB)`
`=3xx(5)/(26)-(2)/(13)=(15-4)/(26)=(11)/(26).`


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