(related to Problem: Defective Observation)
Of course, the date on a penny is on the same side as Britannia — the "tail" side. Six pennies may be laid around another penny, all flat on the table so that every one of them touches the central one. The number of threepenny-pieces that may be laid on the surface of a half-crown, so that no piece lies on another or overlaps the edge of the half-crown, is one. A second threepenny-piece will overlap the edge of the larger coin. Few people guess fewer than three, and many persons give an absurdly high number.
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