2 of 15 + 2 of 35 + 2 of 63 + 2 of 99 + 2 of 143 + 2 of 195 =?

2/15=1/3-15
2/35=1/5-1/7
simple form
=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15
=1/3-1/15
=4/15

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