Abel's summation formula

Abel's summation formula helps us figure out the sum of a sequence of numbers, or how many numbers there are in a sequence. Imagine you have a row of numbers, like this: 2, 4, 6, 8, 10. Abel's summation formula is a way to figure out the total of all these numbers added together - it would be 30. It can also be used to figure out how many numbers are in the sequence - here, there are 5. To understand Abel's summation formula, you need to know about addition, a math skill where you add two or more numbers together.