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Let 
a be a non-zero rational number and 
b be an irrational number. Is 
a*b rational or irrational?
Choose 1 answer:
(A) Rational
(B) Irrational
(C) It can be either rational or irrational

Let aa be a non-zero rational number and bb be an irrational number. Is a×ba \times b rational or irrational?\newline Choose 11 answer:\newline(A) Rational\newline(B) Irrational\newline(C) It can be either rational or irrational

Full solution

Q. Let aa be a non-zero rational number and bb be an irrational number. Is a×ba \times b rational or irrational?\newline Choose 11 answer:\newline(A) Rational\newline(B) Irrational\newline(C) It can be either rational or irrational
  1. Definition of Rational and Irrational Numbers: Let's define what a rational and an irrational number is. A rational number is any number that can be expressed as the quotient or fraction pq\frac{p}{q} of two integers, with the denominator qq not equal to zero. An irrational number is a number that cannot be expressed as a simple fraction - it's decimal goes on forever without repeating.
  2. Representation of a a as a Rational Number: Since a a is a non-zero rational number, it can be written in the form pq \frac{p}{q} , where p p and q q are integers and q q is not zero.
  3. Representation of bb as an Irrational Number: Since bb is an irrational number, it cannot be written in the form of a simple fraction, and its decimal representation is non-repeating and non-terminating.
  4. Multiplication of Rational and Irrational Numbers: When we multiply a rational number by an irrational number, the result is an irrational number. This is because the non-repeating, non-terminating decimal of the irrational number cannot be canceled out or simplified by multiplication with a rational number.
  5. Product of a and b is Irrational: Therefore, the product a imes b is an irrational number, since a non-zero rational number (which has a terminating or repeating decimal representation) cannot turn the non-terminating, non-repeating decimal of an irrational number into a terminating or repeating decimal.

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