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UKMT Junior Mathematical Challenge, 2019

Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

Each row, each column and each of the bold $2$ by $3$ rectangles in the grid has to contain each of the numbers $1, 2, 3, 4, 5$ and $6$ (one number in each cell). What number should go in the cell marked $x$ ?

(A) $1$ (B) $2$ (C) $3$ (D) $4$ (E) $6$

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