Math Olympiad Contest Problems for Elementary and Middle Schools: #68 [HD]

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Published on March 12, 2017 1:02:54 AM ● Video Link: https://www.youtube.com/watch?v=qCnbCQNgw-k

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The counting numbers are arranged in four columns as shown at the bottom. Under which column letter will 217 appear?

A B C D
1 2 3 4
8 7 6 5
9 10 11 12
... ... 14 13