1.

The sum of even numbers from 2 in an order is 240

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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