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SMO 2018 Open Round 1 Question 1

SMO · SMO 2018 Open Round 1

Question 1

In this paper, let $[x]$ denote the greatest integer not exceeding x. For examples, $[5]=5$, $[2.8]=2$, and $[-2.3]=-3$.

Find the area of the region R on the xy-plane consisting of the points (x,y) satisfying the equation $[x]+[y]=10$, where $0\le x\le 3$.

(Note: If you think that the region R does not have any area, enter your answer as “0”; if you think that the region R is unbounded, enter your answer as “99999”.)