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[ GRE ]
討論串[計量] 一題數學
共 11 篇文章
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The odds in favor of winning a game can be found. by computing the ratio of the probability of wining to. the probability of not winning. if the proba
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那呈我剛剛問的觀念~. If Sam were twice as old as he is, he would be. 40 years older than Jim. If Jim is 10 years younger. than Sam, how old is Sam?. 我的算法是. 2sa
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a,b是阿拉伯數字. N = ab = 10a+b. N'= ba = 10b+a. sum = ab + ba = 11a+11b = 11(a+b). sum要等於某平方,所以a+b一定要是11的倍數. 又因為a跟b都是阿拉伯數字,所以可推得a+b=11. 哪些阿拉伯數字組合可以讓a+b=11呢
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