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# متوازی الاضلاع ها در شبکه مثلث

پرش به ناوبری پرش به جستجو

یک مثلث را به ${\displaystyle n^2 }$ مثلث شبکه بندی کرده ایم. تعداد متوازی الاضلاع هایی که رئوسشان روی این شبکه است را به دست آورید.

پاسخ

پاسخ برابر ${\displaystyle 3\binom{n+2}{4} }$ است.