第一道——customizeabikebyexchangingthefrontwheelforawheelthathadonehalfthediameterofthebackwheel,thenwhenridethebike,howmanyrevolutionsdoesthefrontwheelmakeforeachrevolutionofthebackwheel?
C2
D1/2
第二道——When15isdividedbythepositiveintegerk,theremainderis3,.ForhowmanydifferentvaluesofKisthetrue?我觉得是4个(1,2,3,4),但答案给的是3个,为什么,哪里错了?
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