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Two events A and B probabilities 0. 25 a...

Two events A and B probabilities 0. 25 and 0.5 respecively. The probabilities that A and B occur simultaneously is 0.15. Then the probablities that A or B occurs is

A

a) 0.6

B

b) 0.7

C

c) 0.61

D

d) 0.72

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