2.1 A (第二次击落后结束,此时积分期望值最大); 2.2 A (第二次结束时积分期望值=2.49,近似等于2)
解题计算:
2.1 A (第二次击落后结束,此时积分期望值最大); 2.2 A (第二次结束时积分期望值=2.49,近似等于2)
解题计算:
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