Posted by **Tracy ** on Saturday, March 29, 2014 at 10:07am.

Assume that event A occurs with probability 0.4 and event B occurs with probability 0.5. Assume that A and B are disjoint events.

The probability that either event occurs (A or B) is

A. 0.0

B. 0.7

C. 0.9

D. 1.0.

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