1 +3(1/6)+5(1/12)+7(1/20)+9(1/30)+11(1/42)
=(1+3+5+7+9+11)+(1/6+1/12+1/20+1/30+1/42)
=36+[(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)]
=36+(1/2-1/7)
=36(5/14)
1 +3(1/6)+5(1/12)+7(1/20)+9(1/30)+11(1/42)
=(1+3+5+7+9+11)+(1/6+1/12+1/20+1/30+1/42)
=36+[(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)]
=36+(1/2-1/7)
=36(5/14)