8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2
=(1-1/3^2)+(1/3^2-1/5^2)+(1/5^2-1/7^2)+(1/7^2-1/9^2)+(1/9^2-1/11^2)+(1/11^2-1/13^2)
=1-1/13^2
=168/169
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