There is no formula that will sum n even numbers without further qualifications: for example, n even numbers in a sequence.
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n*(n+1)
The sum of the first 20 even numbers... is 110
You cannot. There are infinitely many even numbers and their sum is not convergent.
there isn't a formula for it.you need to calculate it by your own.
You can use the formula for the sum of an arithmetic series to calculate that quickly. (Of course, you can also type the numbers into Excel, and get the sum - but that doesn't scale well - e.g., it won't work well if you are then asked, for instance, to get the sum of the first million even numbers.)