Q.

B1: ({0, 1, 2….(n-1)}, xm) where xn 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» B. semigroups
851
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