1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = (20 x (20 + 1))/2 = 210
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The sum of the first N square numbers is: N*(N+1)*(2N+1)/6 So putting N = 20 gives 2870.
The sum of -5 and 20 is 15. The distance between -5 and 20 is 25. The sum of the numbers between -5 and 20 is 180. The sum of the numbers from -5 to 20 is 195.
Avreage = Sum/number of values So 10 = sum/2 Multiply both sides by 2: 20 = sum
The sum is the result you get when you add two or more numbers together. A single number can be the sum of two or more other numbers when they are added together but cannot be expressed as you ask in your question. Though you could ask "What numbers have the sum of 20?" For instance 20 is the sum of (10 + 10), (5 + 15), (2 + 7 + 11) etc., but is not in itself a sum.
1/x + 1/y y/xy + x/xy (y+x)/xy= 10/20 10/20=1/2 1/2 is the answer.