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दस पत्तो पर 1 से 10 तक की संख्याएँ लिखी है, उन्हें मिलाया जाता है तथा 1 पत्ता यदृच्छया खिंचा जाता है | यदि इस पत्ते पर लिखी हुई संख्या 3 से अधिक है तो इस पत्ते के सम संख्या होने की प्रायिकता ज्ञात करों |

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`S={1,2,…..9,10}`
A= खींचे हुए पत्ते पर सम संख्या आने की घटना
`={2xx4xx6xx8xx10}`
B = खींचे गए पत्ते पर 3 से अधिक अंक आने की घटना
`={4,5,6,7,8,9,10}`
`AcapB={4,6,8,10}`
`P(A)=(n(A))/(n(S))=(5)/(10)=(1)/(2)`
`P(B)=(n(B))/(n(S))=(7)/(10)`
`P(AcapB)=(n(AcapB))/(n(S))=(4)/(10)=(2)/(5)`
`therefore" "P((A)/(B))=(P(AcapB))/(P(B))=((2)/(5))/((7)/(10))=(4)/(7)`

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