Có 6 học sinh nam và 8 học sinh nữ. Trong đó có an và bình.
Tìm cách chọn 1 tổ có 5 người trong đó có 1 tổ trưởng,4 tổ viên sao cho
a) Có An thì không có bình và có bình thì không có an
b) Có cả An và bình
a) Co 1 trong 2 nguoi:
TH1 neu do la to truong thi co 12C4 cach chon to vien
TH2 neu do la to vien thi co 12 cach chon to truong va 11C3 cach chon to vien
vay co 2x( (12C4)+12x(11C3) ) cach
b) TH1 neu 1 nguoi la to truong va 1 lam to vien thi co 2 cach chon
va  12C3 cach chon to vien
TH2 ca 2 la to vien thi co 12 cach chon to truong va 11C2 cach chon to vien vay co
2x(12C3)+12x(11C2) cach 

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