大家帮看看2010年一月sat数学题会的人说下嘛,

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大家帮看看2010年一月sat数学题会的人说下嘛,
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大家帮看看2010年一月sat数学题会的人说下嘛,
大家帮看看2010年一月sat数学题会的人说下嘛,

大家帮看看2010年一月sat数学题会的人说下嘛,
我忘不了你对我的好
穿越了那日月星晨
人最愚蠢的选择就是拿自己的生命来惩罚别人
来留住这所有的忧伤与甜蜜
啊·仿佛被那橙黄色的桌面围困着

  1. At north high school, the ski club has 15 members and the debate club has 12 members. If a total of 11 students belong to only one of the two clubs, how many students belong to both clubs?<...

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    1. At north high school, the ski club has 15 members and the debate club has 12 members. If a total of 11 students belong to only one of the two clubs, how many students belong to both clubs?
      A.2 B.7 C.8 D.12 E.16

      suppose only x students belong to ski club, only y students belong to debate club, z students belong to both clubs.

      11=x+y,
      15=x+z,
      12=y+z,
      27=x+y+2z=11+2z,
      16=2z,
      z=8.
      Answer is C.8.

    2. The digits 1,2,3, and 4 are to be arranged randomly to make a positive four-digit integer. What is the probability that the digits 1,2, and 3 will be directly next to each other, in that order, from left to right?

      A 1/12 B 1/8 C 1/6 D 1/4 E 1/31,


    4/4!=1/3!=1/6
    Answer is C.1/6

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