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斑竹是否搞错了
有几道题我觉得斑竹解错了107. 60 cars, either full-size or compact or sports. 31 is white, 10 is red, 19 is blue, how many cars are full-size?
(1). Not all red and blue cars are full-size.
(2). The number of full-size is greater than the sum of compact and sport cars.
[确定]Ans.: C
答案应为E吧。
114. 10的50次方减74的值, 所有位数的和是多少? 440
[确定] 440
答案应为48*9+(100-74)=458
10的1次方1后1个0,10的2次方1后有2个0,……10的50次方1后有50个0,减去74后应为99999……999(48个9)24。斑竹的440可能搞错了。
185. 6个students, 分成3对. 每对assign English or Chemistry or Math,问能有几个分配法?
[确认]C(6,2)*P(3,3)=90
应为C(6,2)*C(4,2)*P(3,3)吧 |
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