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The sum of even numbers from 2 in an order is 240 |
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Answer» 2 + 4 + 6 + + 2n = 420 2(1 + 2 + 3 + ….+ n) = 420 \(2\times\frac{n(n+1)}{2}=420\) n2 + n - 420 = 0 |
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