[計量] 幾題問題請教
1. 5x = 2y and xy ≠ 0, then is what percent of y ?
Ans: 40% (不會做,覺得題目錯了或是條件給太少)
2. 150, 200, 250, n
which of the following could be the median of the 4 integers listed above?
I. 175
II. 215
III. 235
Ans: II and III only (不懂,個人覺得答案應該是 I and II only)
3. If a code word is defined to be a sequence of different letters chosen
from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio
of the number of 5-letter code word to the number of 4-letter code words?
Ans: 6 to 1 (完全看不懂題目)
4. Which of the following is equal to (2k)(5k-1)?
A. 2(10k-1) B. 5(10k-1) C. 10k D. 2(10k) E. 102k-1
Ans: A (明明題目有k*k, 為什麼答案都只有一個k?)
5. From a group of 3 boys and 3 girls, 4 children are to be randomly
selected. What is the probability that equal numbers of boys and girls
will be selected ?
Ans: 4/9 (個人覺得答案應該是3/5)
6. Which of the following fractions has a equivalent that is a terminating
decimal ?
A. 10/189 B. 15/196 C. 16/225 D. 39/128
Ans: D (看不懂題目)
以上六題 懇請解答!!
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07/29 12:03, , 1F
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