Doubt from Probability

Q 22

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Is it B?

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Yes, it's b. I got it. Thanks for replying

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Don't know the answer

Q 21

The line is a diameter of the circle and there will be equal no. of points above the line on the circle as below it. So, it should be 0.5.

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Oh! Yeah. Missed it badly

Is the answer A,B?


How? The minimum value of intersection of any two events can be 0 & there is no further info about the events.