The formula = 1 2 d1+d2+ ... + dn-1+ 1 2 dn n-1 is the reserve D̅ formula:24/25The formula = 1 2 d1+d2+ ... + dn-1+ 1 2 dn n-1 is the reserve D̅ formula:Maximum reserveMinimum reserveRecurring reserveAverage reserveGiải thíchChọn đáp án D.