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बीस टिकटों पर एक-एक संख्या 1 से 20 तक लिखी है एक टिकट निकाला जाता है उस पर अंकित संख्या के 3 या 5 के गुणज होने की प्रायिकता ज्ञात कीजिए।

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Correct Answer - `(9)/(20)`
`S={1,2,3,.......,20}impliesn(S)=20`
`E={3,6,9,12,15,18,5,10,20}impliesn(E)=9`
`:.` प्रायिकता `=(9)/(20)`

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