[計量] A bowl contains red, green ...
1. calumA: the number of odd positive factors of 30
calumb: the number of even positive factors of 30
答案C
2.in how many ways can a, b, c, d, and e sit at a round table,
if either b or c must sit in seat 1 and neither d nor e can sit 5?
1
5 2
4 3 不會畫圖，想像成圓桌
ans:24
3.a bowl contains red, green and white balls. the probability of choosing
a red ball is 1/3. there are 5 more green balls than red ones, and there
are 12 white balls total. what is the odds against choosing a white ball?
ans. 13/4
4. 1<n<5 n is an integer
column A: the sum of the first n odd integers that are greater than zero
Column B: n^2-1
ans:A
5. X= {2,3,4,5,6,7,8,9 }
Y= {0,1}
Z= {0,1,2,3,4,5,6,7,8,9}
before 1990, telephone area codes in the united states were three-digit
numbers of the form XYZ. shown above are sets X, y, z, respectively,
were chosen. How many possible area codes were there?
ans:144
感謝各位解答
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◆ From: 118.161.44.14
※ 編輯: eziya 來自: 118.161.44.14 (02/17 19:53)
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