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my answer -

All I can say is that the people who answered 0.35 are dead clever as I cannot make head nor tail out of the question. I am still trying to fathom out how they arrived at the answer!

P.S

Happy to help you have an AWESOME!!! day :D

To find P(A or B) of mutually exclusive events, add P(A) and P(B).

0.15 + 0.2 = 0.35

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