| 摘要 |
A betting device is disclosed for indicating all of the combinations of numbers, for example 1 through 12, in groups of only two or three different numbers each, from at least three or four different preselected ones of the numbers. The device comprises a base card having combinations of the numbers 1 through 12 in groups of only two or three different ones of the numbers each thereon. The device further includes a first partially adiaphanous and partially transparent overlay sheet which covers all of the groups of numbers on the base card which include the number 1 and exposes all of the groups of numbers on the base card which include only numbers other than 1 when the first sheet overlays the base card. Likewise, the device includes second, third, fourth, etc. overlay sheets which cover all of the groups of numbers on the base card which include the corresponding number of that sheet and exposes all of the groups of numbers on the base card which include only numbers other than the corresponding number of that sheet when that sheet overlays the base card. As a result, when the overlay sheets corresponding to at least three or four different preselected ones of said numbers are removed from their position overlying the base card all of the combinations of the preselected numbers, in groups of only two or three different ones of the numbers each on the base card, are exposed.
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