Bu noto'g'ri va sizning fikrlashingiz butunlay nuqsonli. Sizning mahsulot ham x va y ikkalasi ham juft yoki ikkalasi ham toq bo'lsa, juft bo'ladi degan taxminingiz noto'g'ri. Ikki toq sonni bir-biriga ko'paytirganda, har doim toq son hosil bo'ladi. X yoki y juft bo'lsa, mahsulot xy juft bo'ladi va shu bilan siz $ \frac {3} {4} $ ehtimolligiga erishasiz. Ammo menga buning isboti kerak, shuning uchun iltimos, ushbu faktni isbotda rasmiylashtiring.
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