Question

Let B={1, 2, 3, 4, 6, 9, 18, 36). For any two elements a and b in B, we define
a+b=LCM{a, b) and a.b=GCD(a, b). The B can be boolean algebra if the
complement of 9 is
A. 9
B. 3
C.1
D. 4​

Answer 1

Answer:

B) 3

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