由 chris8888 » 2007-11-14 14:16
Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and then put back into the bowl; then a second card is drawn. If the cards are drawn at random and if the sum of the numbers on the cards is 8, what is the probability that one of the two cards drawn is numbered 5 ?
我覺得這題目怪怪的, If S + V, S + V
這樣我直接想到的是你算出的總和是8併上條件其中一個是5, 在整個機率裡面是多少?
這句英文我看不出有, 取出是5的機率, 以總和是8的條件在母數裡面為基礎的意涵.
簡單說, 以總和是8為母數, 或者是兩次取出的次數但不考慮點數為母數, 這句英文不清楚.
若要翻譯, 會變成, 如果取出的號碼總和是8, 請問其中一個是5的機率佔多少?
其中是5的機率, 佔整個遊戲的1/18, 不是佔總合8母數的2/5, 當然題目沒有1/18, 所以只能選2/5, but not concise and clear
If the cards are drawn at random and if the sum of the numbers on the cards is 8, on the basis of that ,what is the probability that one of the two cards drawn is numbered 5 ? 或許這樣會清楚一點點