设哈希函数 H有 128个可能的输出 ( 即输出长度为 128 位) ，如果 H的 k 个随 机输入中至少有两个产生相同输出的概率大于 0.5 ，则 k 约等于__。
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0713/1594616384849649.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0713/1594616391484676.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0713/1594616397276325.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0713/1594616402677139.png" />
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正确答案： B 答案分析：无
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