Olga Ch
Роман Евменов
=1/4(1/3-1/7+1/7-1/11+1/11-1/15+1/15-1/19+1/19-1/23)=1/4(1/3-1/23)=1/4*20/69=5/69
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=1/4(1/3-1/7+1/7-1/11+1/11-1/15+1/15-1/19+1/19-1/23)=1/4(1/3-1/23)=1/4*20/69=5/69