Albatta, men to'g'ri isbot beraman. $x$ va $y$ ikkita tasodifiy butun son bo'lsin. $xy$ ko'paytmasi agar va faqat $x$ juft yoki $y$ juft bo'lsa, juft bo'ladi. $x$ juft bo'lish ehtimoli $\frac{1}{2}$ va $x$ burchak bo'lish ehtimoli ham $\frac{1}{2}$. Xuddi shunday fikrlash orqali, $y$ juft bo'lish ehtimoli $\frac{1}{2}$ va $y$ burchak bo'lish ehtimoli $\frac{1}{2}$. Shuning uchun $x$ yoki $$y juft bo'lish ehtimoli quyidagicha berilgan: $\frac{1}{2} + \frac{
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