☆─────────────────────────────────────☆
litaihei (李太黑) 于 (Thu Apr 12 22:25:15 2007) 提到:
A toss N+1 times
B toss N times
P(A has more head than B) = ?
☆─────────────────────────────────────☆
longtian (施主，小僧已经很久不烧香了) 于 (Thu Apr 12 22:58:55 2007) 提到:
1/2?
☆─────────────────────────────────────☆
litaihei (李太黑) 于 (Thu Apr 12 23:00:59 2007) 提到:
how do you get it!
so quick.
☆─────────────────────────────────────☆
foolman (fool) 于 (Thu Apr 12 23:07:27 2007) 提到:
对称性
P(heads of A tos
