b***k
发帖数: 2673 | 1 ☆─────────────────────────────────────☆
Ithink (牛夫人) 于 (Tue May 20 16:20:06 2008) 提到:
In the post by haotianqi2, I found this interesting question. But I don't
understand very well of the solution, and hope some high hand can explain it
a little bit.
What's the definition of E(N-1)? The expectation of the numbers of cards to
get the N-1 card?
Question 1.
A deck of cards with numbers on: 1,2,...,N. Draw a card randomly from the
deck, keep it at hand, then draw another one; if the new one is | k****i
发帖数: 347 | |
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