单项选择题

The odds that a certain event will occur is the ratio of the probability that the event will occur to the probability that it will not occur．If the odds that Pat will win a prize are 4 to 3，what is the probability that Pat will not win the prize（）

A.a
B.b
C.c
D.d
E.e

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单项选择题
The buyer of a certain mechanical toy must choose 2 of 4 optional motions and 4 of 5optional accessories．How many different combinations of motions and accessories are available to the buyer（）

A. 8
B. 11
C. 15
D. 20
E. 30
单项选择题
A certain computer program generates a sequence of numbers P1，P2，……Pn，by the rules P1=1，P2=1，and for n≥3，Pn=Pn+1+pn-2，Which of the following equals P5（）

A. 10
B. 11
C. 14
D. 15
E. 17
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