In multiplicative systems, special names are given not only to 1, b, b2, and so on but also to the numbers 2, 3, , b - 1; the symbols of this second set are then used in place of repetitions of the first set. Thus, if 1, 2, 3, , 9 are designated in the usual way but 10, 100, and 1,000 are replaced by X, C, and M, respectively, then in a multiplicative grouping system one should write 7,392 as 7M3C9X2. The principal example of this kind of

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