7043.......there are 4 digits.
In 'normal' numbers that are greater than zero then zero is superfluous as the first digit, for example we write 437 NOT 0437.
Then, there are 3 possible numbers for the 1st digit (3, 4, 7) and 4 numbers for the 2nd, 3rd and 4th digits.(0,3,4,7).
The number of valid number combinations is, 3 x 4 x 4 x 4 = 192.
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Could you generate a complete set of 6 number combinations from 45 numbers ?
There are 21 combinations.
There are an infinite number of combinations where this could be the answer.
There is no single answer to that. A lot of combinations of 6 numbers could have a mean of 18.5, as any 6 numbers that add to 111 could.
In programming this could be achieved using a numeric bubble sort. Excel allows this type of sorting to be used.