[問題] GWD3 計量問題

看板GMAT (GMAT入學考試)作者wangyihui400 (wanda)時間17年前 (2009/03/22 20:20)推噓0(0推 0噓 0→)

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這是我這一回裡不會的問題,有點多有5題,麻煩大家耐心幫我解一下,感激不盡!! GWD3 2 On Saturday morning, Malachi will begin a camping vacation and he will return home at the end of the first day on which it rains. If on the first three days of the vacation the probability of rain on each day is 0.2, what is the probability that Malachi will return home at the end of the day on the following Monday? A. 0.008 ﹡B. 0.128 C. 0.488 D. 0.512 E. 0.640 Q7: If x < 0, then √(-x ‧∣x∣) is ﹡A. –x B. -1 C. 1 D. x E. √x 這一題我算是D,不懂為什麼是A? Q18: Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m. By what percent did the ratio of price per share to earnings per share increase, in terms of k and m? A. k/m % B. (k-m) % C. [100(k-m)]/(100+k) % ﹡D. [100(k-m)]/(100+m) % E[100(k-m)]/(100+k+m) % Q33: A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible? ﹡A. 5 B. 6 C. 9 D. 24 E. 36 Q34: If Line k in the xy-plane has equation y = mx + b, where m and b are constants, what is the slope of k? (1) k is parallel to the line with equation y = (1-m)x + b +1. (2) k intersects the line with equation y = 2x + 3 at the point (2, 7). ANS.A 這題(2)我知道,但(1)我斜率有些部份有點忘了,麻煩幫我解釋! 謝謝解答!! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.161.96.91