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This question already has an answer here:

Event A has probability of 0.7 and Event B has probability of 0.6. If A and B are independent, what is probability that exactly one occurs?

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marked as duplicate by user147263, Avitus, Adam Hughes, Simon S, Ivo Terek Dec 11 '14 at 0:08

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Two ways. 1-P(both)-P(neither), or $P(A \cap B')+P(A' \cap B)$

1 minus zero or both events. Or (A and not B) + (B and not A).

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