Consider k urns Ui, i=1,...,k, each of which contain m white balls and
n black balls. A ball is drawn at random from urn U1 and is placed in urn
U2. Then a ball is drawn at random frm urn U2 and is placed in urn U3 etc.
Finally, a ball is chosen at random from urn Uk-1 and is placed in urn Uk.
A ball is then drawn at random from urn Uk. Compute the probability that
this last ball is black.
請問這題該怎麼下手？
我先試解k=3，但完全歸納不出個頭緒來
麻煩指點一下，謝謝！
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