Re: [計量] On the number line, if -7 ...
※ 引述《ELASTOMER (惡性循環........)》之銘言:
: On the number line, if -7 is a distance of 4 from n,
: and 7 is a distance of 18 from n, then n=?
: (A)25 (B)11 (C)3 (D)-3 (E)-11
: Ans:(E)
Ans : | -7 - n | = 4 && | 7 - n | = 18
=> -7 - n = 4 or -7 - n = -4 && 7 - n = 18 or 7 - n = -18
所以合理的答案只有 n = -11
: Column A:
: The probability of getting an 8 as a sum when a pair of
: fair dice tossed
: Column B:
: 1/6
: Ans:(B)
Ans : a pair of fair dice 一共有 36 種
而符合兩個dice的和為8的一共有 (6,2), (5,3) , (4,4) , (3,5), (2,6)
5種
故機率為5/36 < 1/6 ,選B
: 麻煩各位幫我解答一下,謝謝
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