In the figure, 2 semi- circles drawn at the centre of the large semi-circle. A fine dot is placed into the figure without looking into it.
a) If the radius of the Smaller circle is taken as 'r' what will be the radius of the larger circle ?
b) what's the probability of being the dot inside shaded semi- circles?
c) what's the probability of being the dot outside the sheded semi- circle?
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