Math

Suppose A and B are events with P (A)=0.25, P(A or B)=0.5, and P (A and B )=0.07. Find each of the following.
a. P(B)=0.07/0.25=.28
b. P (not B)=
Please help me I need the steps to solve the question

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  1. P(A or B) = P(A) + P(B) - P(A and B)
    plug in your values, you are given 3 of the 4

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