Which statement is false? Explain. a. If P(A) = .05, then the odds against event A's occurrence

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Which statement is false? Explain.
a. If P(A) = .05, then the odds against event A's occurrence are 19 to 1.
b. If A and B are mutually exclusive events, then P(A ∪ B) = 0.
c. The number of permutations of 5 things taken 2 at a time is 20.
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