| 摘要 |
In a preferred embodiment of the invention, a string of beads are characterized by a variety of different colors of which at least some beads thereof are of identical colors when indicia thereon are compared and matched, and consecutive beads serially extending between the matched beads are also matched, a centrally located bead of the series of beads in between remaining as an odd unmatched bead contains an indicia which is a mathematical answer of the relationship between the matched compared beads, such as the answer being a sum or a quotient or a product or a square, or the like.
|
