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Standard X
Mathematics
Question

The product of a non-zero rational and an irrational number is
  1. one
  2. always rational
  3. rational or irrational
  4. always irrational

A
always irrational
B
rational or irrational
C
always rational
D
one
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Solution
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Let x be a rational number and y be an irrational number.
Let xy=a.

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