GRE

简答题 For this question，indicate all of the answer choices that apply．
If x=38n，where n is a positive integer，which of the following digits could be the ones digit of X?

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B，E．Absolute values leave positive numbers alone and reverse negative numbers by multiplying by-1．Thus|χ+2|=|2χ-5|represents χ+2=2χ-5and χ+2=-(2χ-5)．The first simplifies to χ=7，the second to χ+2=  -2χ+5 and thus  =1．

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