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02-01-2023
Mathematics

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Each of 10 cards displays two different letters (A, B,C, D, or E), one on the front and the other on the back. The front of each card is shown. No two cards have the same pair of letters. What is the fewest cards you can turn over and be absolutely sure that an E will appear?

Each of 10 cards displays two different letters A BC D or E one on the front and the other on the back The front of each card is shown No two cards have the sam class=

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