1,9,8 and 9
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Pi, and the square root of pi, belong to a category known as transcendental numbers, which means that not only do they have an infinite decimal expansion (the numbers following the decimal go on forever) but the decimal expansion follows no pattern and is unpredictable. Irrational numbers also have an infinite decimal expansion, but not necessarily an unpredictable one.
Yes, the sequence "123456789" appears in the decimal expansion of pi. However, it is important to note that pi is an irrational number with an infinite and non-repeating decimal expansion, so it is expected that any finite sequence of numbers will eventually appear. The exact location of "123456789" in the digits of pi is not known due to the random and non-repeating nature of pi's decimal expansion.
3.142
9 and 3 are in the 14th and th decimal place for the value of pi.
An infinite amount.