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【单选题】
According to the text, why did Justin want to have a cat?A.
Because Justin always had a cat as his pet.
B.
Because Justin’s first two cats died.
C.
Because Justin’s mother died.
D.
Because Justin’s father told him so.
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举一反三
【单选题】The difference between a permutation and a combination is:
A.
in a permutation order is important and in a combination order is not important.
B.
in a permutation order is not important and in a combination it is important.
C.
a combination is based on the classical definition of probability.
D.
a permutation is based on the classical definition of probability.
【单选题】The difference between a permutation and a combination is
A.
a combination is based on the classical definition of probability.
B.
in a permutation order is not important and in a combination it is important.
C.
in a permutation order is important and in a combination order is not important.
D.
a permutation is based on the classical definition of probability.
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