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Unformatted text preview: committees and subcommittee. Now assume that we pick the subcommittee rst. This can be done in n i ways. We then pick the committee in ni ji ways resulting in a total n i ni ji . Part (b): I think that the lower index on this sum should start at i (the smallest subcommittee size). If so then we have n j = i n j j i = n j = i n i ni ji = n i n j = i ni ji = n i ni j =0 ni j = n i 2 ni ....
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 Winter '08
 G.JOGESHBABU
 Probability

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