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2 + 4 + 6 + 8 + 10 = 30 In general, the sum of the first n even numbers is n(n+1). Replacing n with 5 we have 5x6 which equals 30 as we found by direct calcuation. The formula is nice when you have many numbers. For example, finding the sum of the first 100 positive even numbers would be a PAIN! But using the formula is it simply 100x101.

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15y ago
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MD MUJAFAR ALI

Lvl 2
3y ago

5(5+1)

5*6 =30

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Q: What is the sum of the first five positive even numbers?
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