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解1000個數裡面偶數有500個 所以能被2整除的概率有500/1000=1/2 又能被5整除的,偶數都已經算過 只需要求5的奇數倍個數 即5,15,45,.995的個數 (995-5)÷10+1=100個 概率為100/1000=1/10 所以能被2或5整除的概率為1/2+1/10=3/5
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