How likely is there to the group of 5 numbers 0-9 without repeating a single digit?
What would be the equation and also have another equation to find out all possible sums of groups of 5? ie 0 +1 +5 +8 +6 = 20, amounts that could be repeated, but not numbers in the equation
to solve this problem, all you have to do is take 10 to choose 5 equals (10 * 9 * 8 * 7 * 6) / (5 * 4 * 3 * 2 * 1) or 252. Your second question is a bit blurry. To find the number of sums possible, take the maximum amount under the minimum amount +1 (because it is inclusive) by which has 26 options, all from 15 to 40 inclusive. If you want the sum of them all, take (40 * (40 +1)) / 2 - (15 * (15 +1)) / 2
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