Let I,J be the ideals of a ring P. Show that the sets (a)lJ = {a,b, +.….+a,b, :a, E1,b, E J,n=1,2,...} (b)l + J={a+b:a€l,bEJ} (c)InJ are the ideals of the ring, and prove If 1+J=P, then INJ=IJ

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