a. B is two continuous natural numbers greater than 0, and their greatest common factor is______ The least common multiple is______ A.1 B.a C.b D.ab.
Because a and B are two adjacent natural numbers, and (a, B are not 0), that is, a and B are coprime, then: the greatest common factor of a and B is 1; the least common multiple is ab; so: A, D