if 31y5 is a multiple of y where y is a digit what are the value of y
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y=1,3,5,9
3115%1=0
3135%3=0
3155%5=0
3195%9=0
(where %refers to mod)
3115%1=0
3135%3=0
3155%5=0
3195%9=0
(where %refers to mod)
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