5.13 Sample online data

#1

On page 56 (Python ver.), it’s wrote, after stating we have p, q, initially, “We select the next packet, r, with probability 2/3. Suppose it is not selected.” My question is that why do we have 2/3 as a prob. that r belongs to new subset when we choose only one element out of three candidates, [p, q, r], even considering the replacing procedure afterwards?

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#2

i hope this helps

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