[計量] GWD 24-04 以及 GWD 23-30
GWD 23
Q30:
There are 8 books on a shelf, of which 2 are paperbacks and 6 are hardbacks.
How many possible selections of 4 books from this self include at least
one paperback?
A.40
B.45
C.50
D.55
E.60
答案是C
我算法是 C(8,4)-C(6,4)=55 結果得出來答案是C @@
也是同一類型題
GWD 24
4
A shipment of 8 television sets contains 2 black-and-white sets
and 6color sets. If 2 television sets are to be chosen at random
from this shipment, what is the probability that at least 1 of
the 2 sets chosen will be a black-and-white set?
A.1/7
B.1/4
C.5/14
D.11/28
E.13/26
答案是E
我覺得這兩種題目應該是用同一種方法算阿?!
可是不知道為啥跟答案不太一樣?
是答案有誤還是我誤解了?
請各位幫忙! ^_^
謝謝!
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※ 編輯: PINKENVI 來自: 218.163.200.244 (06/11 20:55)
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