单项选择题

A certain computer program generates a sequence of numbers P₁，P₂，……P_n，by the rules P₁=1，P₂=1，and for n≥3，P_n=P_n+1+p_n-2，Which of the following equals P₅（）

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

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单项选择题

If for a given spin，the pointer shown in the figure above is equally likely to stop on any of the numbered sectors，what is the probability that the pointer will stop on an odd-numbered sector(Assume that the pointer cannot stop on a dividing line between sectors．)（）

A.A
B.B
C.C
D.D
E.E

单项选择题

The odds in favor of winning a game can be found by computing the ratio of the probability of winning to the probability of not winning．If the probability that Pat will win a game is ，what are the oddle that Pat will win the game（）

A.4 to 5
B.4 to 9
C.5 to 4
D.5 to 9
E.9 to 5

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