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Question

If x is rational and y is irrational, then show that (x + y) is always irrational.

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Solution

Let x be a rational number and y be an irrational number. Now, let (x+y) be a rational number c.So, we have:x+y=cy=c-xNow, c-x is a rational number because both x and c are rational, but y is irrational; thus, we arrive at a contradiction.Hence, the sum of a rational number and an irrational number is an irrational number.

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