c*****o
发帖数: 178 | 1 you have a deck of cards (52 cards plus a joker). You put the cards facing
down, and you pick up one card at a time from top. What is the probability
that the joker is picked after all aces are picked? | P*******9
发帖数: 9700 | | n******h
发帖数: 50 | | c*****o
发帖数: 178 | | s*******s
发帖数: 1568 | 5 1/5, ignore all other cards
【在 c*****o 的大作中提到】
: you have a deck of cards (52 cards plus a joker). You put the cards facing
: down, and you pick up one card at a time from top. What is the probability
: that the joker is picked after all aces are picked?
| c**********e
发帖数: 2007 | 6 Correct. All other card ignorable.
It is equivalent to the permutation of the 5 cards.
The probability of the joker being the last one is 1/5.
Clearly, joker being in any other order is the same.
For example, the probability of joker after 3rd Ace and before
the last Ace is alsoe 1/5.
【在 P*******9 的大作中提到】
: 1/5?
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