[計量] 請問幾題數學
1.How many different three-digit even numbers can be formed from the set of
integers from 1 to 9 inclusive if no digit may appear twice?
Ans: 224
符合even numbers 的不是只有2 4 6 8 四個數字，要排在三位，我怎麼算都沒有破百
種的可能@@
2.In how many different arrangements can six guests and one host be seated
at a round table?
Ans: 720
這種題目真的是我的死穴，不知道要怎麼解答
3.Before the start of a horse race, and based on the past performance of the
horse entered, the spectators are told that the chance are 4 to 1 that Aegis
will win.What is the probability that Aegis will lose?
Ans:1/5
不是很單純，1/4的贏，就代表3/4的輸，我知道我錯了，但是不知道為什麼!!
4.If two cards are drawn at random without replacement from a standard deck
of 52 cards that contain four different suits of 13 cards each, what is
the probability that both cards will be of a given suit?
Ans:1/17
真的不行，都忘光了@@
麻煩各位幫忙一下了
謝謝大家
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