Final answer:
The digit 9 is completely missing in the first 30 decimal places of Pi's decimal expansion.
Step-by-step explanation:
In the first 30 decimal places of π, the digit 9 is completely missing. To understand why, we need to consider the concept of significant figures. In the context of decimals, significant figures refer to the digits that provide meaningful information about the precision of a measurement or calculation.
When we look at the decimal expansion of π, we have to analyze each digit to determine if it is significant or not. In this case, the first 30 decimal places of π are 3.141592653589793238462643383279, and we can see that the digit 9 is not present in this sequence.
This means that, based on the current understanding of π, the digit 9 does not appear in the first 30 decimal places. However, it's worth noting that this does not necessarily mean that the digit 9 will never appear in π. The nature of π being an irrational number means that its decimal expansion continues infinitely and is believed to contain all possible digits.