1/4+1/28+1/70+1/130

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1/4+1/28+1/70+1/130
1/4+1/28+1/70+1/130

1/4+1/28+1/70+1/130
1/4+1/28+1/70+1/130=2/7+1/70+1/130=3/10+1/130=4/13