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被2整除的個數:5*2,6*2,.49*2,共45個 被3整除的個數:4*3,5*3,.,33*3.共30個 被6整除的個數:2*6,3*6,.16*6.共15個 10-99中能被2或3整除的整數共:45+30-15=60個 10-99中的整數共:90個 所以10-99中能被2或3整除的概率為60/90=2/3
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