[計量] CAT test8、9、10
CAT test8
1.X+Y = 5
A : The greatest value of xy
B : 6
ans :A
(X,Y) = {(0,5),(1,4),(2,3),(3,2),(4,1),(5,0)}
2*3 = 6 <= max 不是嗎?
答案應該是C吧?
9. 1<d<2 and d+0.01<2
A : The tenth's digit of the decimal representation of d
B : 9
ans : D
是因為有可能 d=9 or d<9 ?
16. For every positive integer n, the notation n! represents the product of
the first n integers. n! = n(n-1)(n-2)....3*2*1
What is the tens digit of 40!/28! ?
ans : (A) 0
不會算..
26. When the odds or chances are against the occurrence of a certain event,
it can be found by computing the ratio of the probability of nonoccurrence
to the probability of occurrence
A : The odds against getting a 7 as a sum when a pair of the fair dice
tossed.
B : 6
ans : B
看不懂...
CAT test9
6. A rectangular solid has a volume of 30, and its edges have integer lengths.
What is the greatest possible surface area of this solid?
ans : 122
CAT test 10
25. In the xy-plane, O is the center of circle with coordinate (m,4),and a
point(m,-1) is on the circle.
A : The circumference of circle O
B : 32
ans : B
當O為圓心，在x=m上並且交此圓於兩點y1、y2，而|y1| == |y2|不是嗎?
Why會交於(m,4)與(m,-1)?
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