(ii) If 31z5 is a multiple of 3 , where z is a digit , what might be the values of z?
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The value of of z is multiples of 3...because when we add all no of 31z5 we get( 9 plus z) what we put into it in multiples of 3 ..Nine is multiples of 3 and anything added to nine in multiples of 3..The whole no can become the multiple of 3...
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