Report copyright - MATH/VI/09 ( 2 ) 2 0 1 6 ( 6th Semester ) · subset S of a ring R to be a subring are (a) a-b˛S and a b ˛S for all a,b˛S ( ) (b)a-b˛S and ab˛S for all a,b˛S ( ) (c)a+b˛S and
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