For any intergers X and Y , min(X,Y) and max(X,Y) denote the minimum and the maximum of X and Y, respectively. For example, min(5,2) =2 and max(5,2)=5. For the integer W, what it the value of min (10, W) ?
1. W=max (20,Z) for some integer Z. 2. W=max (10,W)
Ans: D
我不懂的是 條件(1)下 W=max (20,Z)的Z不確定 , 怎麼可以確知 W>=20, Z 難道不會是最max?
1) W is bigger than 20 because it equals to max (20, Z). Sufficient because it doesn't matter what Z is, the max of (20, Z) cannot be smaller than 20, For example, if Z is 10, then max (20, Z) is 20, if Z>20, then the max of (20, Z) is > 20... therefore W > 20 > 10
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发表于 2012-2-13 21:21:41
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