shyind wrote:
Just a thought,
\(16^2+.....+30^2\) = 256+.....+900
\((\frac{900+256}{2})\)*15= 578*15 = 8670 (close to D)
Can we consider this approach ?
This is the approach that I used to come up with a logical solution. Not sure if it's good or not.
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