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Probability on a Venn diagram- P(A' U B)

Hello,I am currently looking over some past papers I have done for my mocks as revision for GCSE Maths Higher, and I am having some trouble figuring out one of the questions. The question shows a Venn diagram with the section inside one of the circles on the right labeled as A with a probability of 0.3 . The other Circle is labeled as B and has a probability of 0.35 . The section in the middle has a probability of 0.15 . The questions asks:
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