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1. |
B₁: ({0, 1, 2….(n-1)}, xₘ) where xₘ stands for “multiplication-modulo-n” and B₂: ({0, 1, 2….n}, xₙ) where xₙ stands for “multiplication-modulo-m” are the two statements. Both B₁ and B₂ are considered to be __________ |
A. | groups |
B. | semigroups |
C. | subgroups |
D. | associative subgroup |
Answer» C. subgroups | |