→ halaphone:25已在精華區找到答案了 09/19 17:58
Q10
A set of numbers has the property that for any number t in the set, t+2 in the
set. If -1 is in the set, which of the following must also be tn the set?
I. -3 II. 1 III. 5
Ans: II and III only
此題我是想成t+2=-1 所以t=-3
Q19
Total of $60,000 was in vested for one year. But of this amount earned simple
annual interest at the rate of x% per year, and the rest earned simple annual
interest at the rate of y% per year. If the total interest earned by the
$60,000 for that year was $4,080, what is the value of x
(1) x=(3/4)y
(2) The ratio of the amount that earned interest at the rate of x% per year to
the amount that earned interest at the rate of y% per year was 3 to 2
Ans: C
Q22
In the sequence 1,2,4,8,16,32......each term after the first is twice the
previous ter. what is the sum of the 16th, 17th, 18th terms in the sequence
A. 2^18 B. 3(2^17) C. 7(2^16) D. 3(2^16) E. 7(2^15)
Ans:E
我的算法是
2^16 + 2^17 + 2^18
=2^16 + 2(2^16) + 4(2^16)
=7(2^16)
Q25
A photographer will arrange 6 people of 6different 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
Ans:A
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