compatible number
Infinitely many. If you restrict yourself to positive numbers only, but allow repetitions, then there are 15. If you disallow repetitions, only 2.
If you allow fractions and decimals, then there are an infinite number of them. If you only want to talk about whole numbers, then there are only nine of them.
It is difficult to interpret exactly what you are trying to ask. If you allow your five digit number to have leading zeroes and do not allow negative numbers, then 00000 - 99999 = -99999 is the smallest number. If you do allow negative 5 digit numbers, then (-99999) - 99999 = -199998 is the smallest number.
A pair of numbers used to locate a point is known as a coordinate pair. In the ordinary number plain this might be (0,0) or (1.5, 4) Any two coordinate pairs allow you to define a line. Higher numbers of coordinate pairs allow you to define shapes or paths
There are several combinations of odd numbers that add up to 43. For example, 3 + 29 + 11 is equal to 43, so is 5 + 27 + 11, and many more. In fact, if you allow negative numbers, you have an infinite number of combinations.
There are not 99999999 eight digit numbers - unless you allow numbers with leading 0s.
These would numbers like 1122, 9988, 2233.There are 81 such numbers. (90 if you allow 0011, 0022, ...)
No
There are 24 different arrangements of 4 numbers (4 factorial or 4!). If you allow numbers to be repeated then the figure becomes 256 (44)
Integers are closed under subtraction, meaning that any subtraction problem with integers has a solution in the set of integers.
There are 76 such numbers. Eight more if you allow numbers to start with 0.
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In base ten, there are 9000 four digit number, the numbers are from 1000 to 9999. If you allow leading zeros, then there are 10000 numbers. [0000 - 9999]
There are many purposes for numbers, perhaps the most basic is to allow us to manipulate quantities, both real and abstract.
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There are a few services which allow individuals to find phone numbers online. The White Pages online, Switch Board, and People Finders allow individuals to locate phone numbers online.
Infinitely many. If you restrict yourself to positive numbers only, but allow repetitions, then there are 15. If you disallow repetitions, only 2.