1/3+1/15+1/35+1/63+1/99+1/143=

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1/3+1/15+1/35+1/63+1/99+1/143=1/3+1/15+1/35+1/63+1/99+1/143=1/3+1/15+1/35+1/63+1/99+1/143=1/3+1/15+1

1/3+1/15+1/35+1/63+1/99+1/143=
1/3+1/15+1/35+1/63+1/99+1/143=

1/3+1/15+1/35+1/63+1/99+1/143=
1/3+1/15+1/35+1/63+1/99+1/143=
1/2(1-1/3)+1/2(1/3-1/5)+1/2(1/5-1/7)+1/2(1/7-1/9)+1/2(1/9- 1/11)+1/2(1/11-1/13)
=1/2(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13)
=6/13