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Question
What can you say about the prime factorisations of the denominators of the following rationals:
0.120120012000120000....
Numerical
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Solution
Since 0.120120012000120000.... has non-terminating decimal expansion.
So, its denominator has factors other than 2 or 5.
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Chapter 1: Real Numbers - EXERCISE 1.6 [Page 1.42]
