Nikita ran a 5-kilometer race in 39 minutes (0.65 of an hour) without training beforehand. In the first part of the race, her av
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1. Let a: rolling an even number, b: rolling an odd prime number
2. a={2, 4, 6, 8, 10, 12, 14, 16}, b={3, 5, 7, 11, 13}
3. So n(a)=8, n(b)=5 , n(Sample Space)=n(S)=16
4. Since a and b are mutually exclusive events, that means they have no common elements, P(a or b)=P(a)+P(b)=
2. a={2, 4, 6, 8, 10, 12, 14, 16}, b={3, 5, 7, 11, 13}
3. So n(a)=8, n(b)=5 , n(Sample Space)=n(S)=16
4. Since a and b are mutually exclusive events, that means they have no common elements, P(a or b)=P(a)+P(b)=