Question: 1. (6 points) Let R be a commutative ring, and let a, be R. Show that N = {ra + sb | r, s e

1. (6 points) Let R be a commutative ring, and
1. (6 points) Let R be a commutative ring, and let a, be R. Show that N = {ra + sb | r, s e R} is an ideal of R

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