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  3. say r1, r2,...., rn are commutative rings with uni

say R1, R2,...., Rn are commutative rings with unity. Show that U(R1 + R2 +.... + Rn)...

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Advance Math

say R1, R2,...., Rn arecommutative rings with unity. Show that U(R1 +R2 +.... + Rn) = U( R1) +U(R2)+ .... U(Rn). Where U - is the units ofthe ring.

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