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The sum of the first 39 positive even numbers is

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1 vote

Answer:

380

Explanation:

The last of the 39 even numbers ends up at 78.

So let's find the even numbers up to that point,

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, and 78.

Add them all up:

= 380

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