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Question

In Boolean algebra, A+B=Y implies that
  1. sum of A and B is Y.
  2. Y exists when A exists or B exists or both A and B exist.
  3. Y exists only when A and B both exist.
  4. Y exists when A or B exist but not when both A and B exist.

A
Y exists only when A and B both exist.
B
Y exists when A or B exist but not when both A and B exist.
C
sum of A and B is Y.
D
Y exists when A exists or B exists or both A and B exist.
Solution
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In Boolean algebra, A+B=Y implies that Y exists when A exists or B exists or both A and B exist.

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