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Which card or cards must be turned over to test the idea that if a card shows an even number on one face, then its opposite face is blue? The Wason selection task (or four-card problem) is a logic puzzle devised by Peter Cathcart Wason in 1966. [1] [2] [3] It is one of the most famous tasks in the study of deductive reasoning. [4]
Return postcards consist of a single double-size sheet, and cost double the price of a usual postcard – one addresses and writes one half as a usual postcard, writes one's own address on the return card, leaving the other side blank for the reply, then folds and sends.
A one sheet is a specific size (typically 27 by 41 inches (69 cm × 104 cm) before 1985; 27 by 40 inches (69 cm × 102 cm) after 1985) of film poster advertising. Multiple one-sheets are used to assemble larger advertisements, which are referred to by their sheet count, including 24-sheet [ 9 ] billboards , and 30-sheet billboards.
The portrayals of various American presidents made their first appearances on U.S. postage at different times for very different reasons. Among the most definitive is George Washington, whose engraving (along with that of Benjamin Franklin) appeared on the first U.S. Postage stamps released by the U.S. Post Office, on July 1 of 1847.
In this case the possibility of multiple winning cards is unavoidable because any one of twelve patterns on every card can win the game. But not all 552 septillion cards need to be in play. Any given set of numbers in a column (e.g., 15, 3, 14, 5, 12 in the "B" column) can be represented in any of 5!
One large mix-up occurred at the 1895 Cotton States and International Exposition in Atlanta. [5] All of the postcards there were printed on plain card stock, so most people assumed they were government-issued postals requiring one cent for postage instead of two. [5] The incident made the headlines. [5]
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