各季度號碼 計算 (12450)

E2{=COUNT(0/(MATCH(A$2:A$21&INT((MONTH(B$2:B$21)-1)/3)+1,A$2:A$21&ROW(A1),)=ROW($1:$20)))

另解=SUMPRODUCT((MATCH(A$2:A$21,A:A,)=ROW($2:$21))*(INT((MONTH(B$2:B$21)-1)/3)+1=ROW(A1)))