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UKMT Junior Kangaroo, 2018

Combinatorics Difficulty 1.0 Junior Find the answer United Kingdom

The diagram below shows five rectangles, each containing some of the letters P, R, I, S and M. Harry wants to cross out letters so that each rectangle contains only one letter and each rectangle contains a different letter. Which letter does he not cross out in rectangle 2?

(A) P (B) R (C) I (D) S (E) M

Figure for this problem

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