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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.
The decimal expansion of an irrational number is non terminating and non recurring
It is the decimal approximation to the value of the irrational number.
If its a rational number then its decimal equivalent can be expressed as a fraction
No. If the decimal expansion falls into a repeating pattern (however long) then the number is rational. For example, 0.33... is the rational number 1/3. or 0.04142857142857... where the pattern 142857 continues forever is the rational number 29/700.
It is 300 + 50 + 7.
A decimal expansion means to write out the base 10 digits of a number. Because irrational numbers do not have a closed form, the decimal expansion will always be an approximation. Consider the irrational number pi, which has the following decimal expansion: 3.14159265... Of course there are more digits to pi than that, which is denoted by the "...". It is sadly impossible to list ALL of the digits of an irrational numbers, since if there were a finite number of digits, you could express it as a fraction, which would not be irrational.
Its decimal "expansion" is 30, as in the question. You could express it as 30.000... except that doing so would imply a greater degree of precision.
No. This number is an impossible decimal. Only one decimal can appear in a number at a time.
No. It must be infinite AND non-recurring.
Decimals that terminate or repeat in some fashion are rational, while decimals that expand forever are irrational.
It terminates or has a infinite repeating expression.