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10 February, 15:49

A positive integer is subtracted from it's square. The units digit of the result could be which of the following

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  1. 10 February, 15:54
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    Hello,

    If n∈5N = = >0

    If n∈5N+1 = = >0

    If n∈5N+2 = = >2

    If n∈5N+3 = = >6

    If n∈5N+4 = = >2
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