Dies ist Frage 20 aus dem Mathematikbereich des koreanischen SAT (CSAT) 2026. Mit einer Erfolgsquote von nur 29,9 % war es das sechstschwerste Problem der Prüfung. Um eine perfekte Punktzahl zu erreichen, sollten Sie versuchen, das Problem in etwa 5 Minuten zu lösen. Lass es uns versuchen!
https://i.redd.it/k1in93o6nhwg1.png
4 Kommentare
This could have been a problem in our german computer science bachelor math class. Heavy stuff.
Challenge accepted.
(A)=n/3=f(n) from elementary algebra;
Since a_1=7, a_2=(B)=10 from substituting n=2 into the given equation;
a_1+a_2=17, and the expression inside Σ can be replaced with 2k+1 (∵㉠)
Thus, (C)=52. The requested value should be 130.
Took me 5~6 minutes. Since most of the process is already given, the problem isn’t that hard. Disclaimer: There may be miscalculations, I wasn’t being very careful.
– A Certain Korean Teen, who is looking to do anything except studying for his upcoming midterm exams
Are we going to do these posts forever?
have a question, p is a number and q is a number too. Both of these numbers can be calculated. It then says find the product of pq of pq/f(12). How is the function f relevant here? Given that both p and q can be calculated already why is the pq/f(12) even there at all? Is it a translation error perhaps? Surely the question is either find pq/f(12) or just find pq?