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Is the following number rational or irrational?

0. bar(151)
Choose 1 answer:
(A) Rational
(B) Irrational

Is the following number rational or irrational?\newline0.1510.\overline{151}\newlineChoose 11 answer:\newline(A) Rational\newline(B) Irrational

Full solution

Q. Is the following number rational or irrational?\newline0.1510.\overline{151}\newlineChoose 11 answer:\newline(A) Rational\newline(B) Irrational
  1. Represent as fraction: Let's represent 0.1510.\overline{151} as a fraction to see if it's rational or not. Let x=0.151151151x = 0.151151151\ldots
  2. Multiply by 10001000: Multiply xx by 10001000 to shift the decimal three places to the right: 1000x=151.1511511000x = 151.151151\ldots
  3. Subtract original x: Subtract the original xx from 1000x1000x to get rid of the repeating decimals: 1000xx=151.151151...0.151151...1000x - x = 151.151151... - 0.151151...
  4. Simplify to x=151999x = \frac{151}{999}: This gives us 999x=151999x = 151, which simplifies to x=151999x = \frac{151}{999}.
  5. Conclusion: xx is rational: Since we can express xx as a fraction (151999\frac{151}{999}), it means xx is a rational number.

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