one less than infinity cn be equibelant to infinity but less than infinity at the same time because it is one"LESS" than infinity its still way more than quadrillion(thousand trillions) and a septillion and a sextillion (im 9)
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As infinity is a concept and not an actual number, one less than infinity can only be written as [infinity - 1]. Any attempt to "tinker" with infinity to get "infinity - 1" and "infinity + 1" and "infinity times 10" all things that we need to set aside.
It just equal infinity
The probability is zero. No number can be less than 3 and greater than 4.
There is more than one notation, but the open interval between a and b is often written (a,b) and the closed interval is written [a,b] where a and b are real numbers. Intervals may be half open or half closed as well such as [a,b) or (a,b]. For all real numbers, it is (-infinity,+infinity), bit use the infinity symbol instead (an 8 on its side).
mixed number
Because probability is measured from zero to one, where zero means something cannot happen and one meaning it will definitely happen. This can also be looked at as there being a 0% chance or 100% chance of it happening. So obviously there can not be less of a chance than it definitely not happening, so it cannot be less than zero.
Assuming you're using 6-sided dice, The probability of rolling less than 4 on one die is 1/2. To roll 3 dice and get less than 4 on 2 (and only 2) of them is 3/8.