[問題] GRE數學問題
大家好，有兩個問題想請教大家:
1.A certain five-number committee must be assembled form a pool of 5
women---A,B,C,D,E, and three men—X,Y,Z, what is the probability that the
committee will include B,C,E,Y and Z?
A.1/30(ANS) B. 1/25 C.2/35 D. 1/15 E.3/32
2. On a certain number live, if -7 is a distance of 4 from n and 7 is a
distance of 18 from n then n=?
A.25 B.11 C.3 D.-3 E -11(ANS)
這題到底誰是距離誰是數列上的數字啊? 整個糊塗了...
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