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1^2+2^2+3^2+…+n^2=n(n+1)(2n+1)/6
2²+4²+6²+8²+………+100²
=4*(1²+2²+3²+4²+………+50²)
=4*50*(50+1)*(100+1)/6
=171700
2²+4²+6²+8²+………+100²
=4*(1²+2²+3²+4²+………+50²)
=4*50*(50+1)*(100+1)/6
=171700
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