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[問題] 巧妙數列

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如果唔是15,真的唔知會是甚麼....

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15........

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i don't know
hallo

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19呀!!!!!!!!!!!!!1
hallo

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12!!!!!!!!!!!!!!!!!!!!!!!!!
hallo

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16吧~~~~~~~~~~~~~~??是嗎 ?

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15呢.......

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The answer is 15!! The upper number subtract the lower number...

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