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Let R be a commutative ring with unity. I and J are ideals of R.

Show that If I + J = R, then I∩J=IJ.

I know that IJ⊆(I∩J).

But I can't do inverse.

Show that If I + J = R, then I∩J=IJ.

I know that IJ⊆(I∩J).

But I can't do inverse.

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