if 1²+2²+3²+.....10²=385,then the value of 1/2(2²+4²+6²+......20²) is......????
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(1²+2²+...) = 385
(2²+4²+6²+..) = 1/2(2²*1+2²*2²+2²*3²+...)
= 2²(1²+2²+3²+...) = 1/2(4*385)=770
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