The events A and B are independent if and only if (iff)
Let "A" be the event, that the chairman of the board attends a meeting, "B" be the event, that the president of the company attends a meeting.
Given that "P(A)=0.65, P(B)=0.9, P(A\\cap B)=0.6"
Check the independence
Therefore, the chairman and the president don't act independently regarding their attendance at the meetings of the board of directors.
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