If you are assuming you can repeat any of the numbers then:
nx
where n=number of options and x= number of spaces
using the formula assuming all numbers 0-9 then:
1010
10,000,000,000 is your answer.
If numbers can not repeat and have to be used we use the formula:
n!
Where n is the number of options.Since you want 10 numbers we will do 10!
10!
10*9*8*7*6*5*4*3*2*1
362880 is your answer.
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Oh, isn't that a happy little question? Let's see here... To find the number of combinations of 4 numbers out of 7, we can use a simple formula: 7 choose 4, which is calculated as 7! / (4! * (7-4)!). So, there are 35 unique combinations of 4 numbers that can be made from a set of 7 numbers. Isn't that just delightful?
If the numbers are allowed to repeat, then there are six to the fourth power possible combinations, or 1296. If they are not allowed to repeat then there are only 360 combinations.
Just one. * * * * * Depends on how many numbers are on each ring. If there are x numbers, then the total number of combinations (actually they are permutations) is x*x*x or x3.
There are: 9C6 = 84 combinations
10 Combinations (if order doesn't matter). 3,628,800 Possiblilities (if order matters).