to find the numbers between two numbers use this formula and reblace the a with the smaller number and b with the larger number
((b^2+b)/2-b)-((a^2+a)/2)
so the answer is 135 not including 20 as part of the sum
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The sum is 75.
The sum of all even numbers between 10 and 20 can be found by adding the even numbers in that range. The even numbers between 10 and 20 are 12, 14, 16, and 18. Adding these numbers together, 12 + 14 + 16 + 18 equals 60. Therefore, the sum of all even numbers between 10 and 20 is 60.
To find the sum of all even numbers between 10 and 20, we first need to identify the even numbers in that range. The even numbers between 10 and 20 are 10, 12, 14, 16, and 18. Adding these numbers together, we get 10 + 12 + 14 + 16 + 18 = 70. Therefore, the sum of all even numbers between 10 and 20 is 70.
The answer is 28
The sum of the five odd numbers between 10 and 20 is: sum = 5 x (11 + 19) / 2 = 75.