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(1/8+1/24+1/48+1/80+1/120+1/168+1/224)*64=(1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16)*64=1/2*(1/2-1/4+1/4-1/6+.+1/14-1/16)*64=32(1/2-1/16)=16-2=14
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