[計量] CAT test7
4. column A
The number that is as much greater than 63 as it is less than 101
column B
84
ans:B
題目看不懂...
7. column A
The number of ways to exchange a $100 bill for $5,$10,or $50
Column B
17
ans : A (18)
我列舉出所有情況，共18種，但有其它算法嗎?記得以前高中有類似的題目
10. S is a set of all scalene triangles with the perimeter of 7 and sides of
integer length
column A
The number of scalene triangles in the set of S
column B
3
ans : B
(2,2,3) (3,3,1) ?這兩種? 不是要是Scalene triangles?
M-W : scalene : of a triangle having the three sides of unequal length
21. Four boys and three girlsare arranged to seat in two rows, the first
containing four seats and the second three seats.
How many arragements are there if three grils sit together?
ans : (D) 432
why?
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