2.1 A (第二次擊落後結束,此時積分期望值最大); 2.2 A (第二次結束時積分期望值=2.49,近似等於2)
解題計算:
2.1 A (第二次擊落後結束,此時積分期望值最大); 2.2 A (第二次結束時積分期望值=2.49,近似等於2)
解題計算:
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