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Answer:
Given two events A and B of a sample set :-
P[A] = 0.20
P[not B]=0.40
To find P[A or B]:
......[1]
Calculate for and
P[B] = 1- P[not B]
Substitute the value P[not B] we get;
P[B] = 1-0.40 = 0.60
Substitute the given values we get;
Then;
Therefore, the value of P[A or B] is, 0.75.