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Answer:
 (d)  Any irrational number multiplied by any non-zero rational number is equal to an irrational number.
Step-by-step explanation:
If a number cannot be represented by a fraction, multiplying it by a fraction will not change that fact.
 Any irrational number multiplied by any non-zero rational number is equal to an irrational number.
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Counterexamples
(a) 3+Ï€ is irrational
(b) π + π is irrational
(c) 3Ï€ is irrational
(d) true