一道概率题...没什么思路

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 ?

答案: 2/5

没什么思路.请教ING....

如果合是8的话可以如下组合： 4+4，3+5，2+6，5+3 6+2   所以啊，卡片被话了5的，就是2/5的概率