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If the probability of a spinner landing on red in a game is 1/5, what is the probability of it not landing on red?
P(A) - probablity of a spinner landing on red P(A') - probablity of it not landing on red. From formula: P(A) + P(A') = 1 Substitute P(A) =1/5 : 1/5 + P(A')=1 P(A')=1-1/5 P(A') = 4/5 =4/5 * 100% = 80% So this probablity is 4/5 (or 80%, if you want to have it on a percent)
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