Hi 12 People: 7 ML and 5 SL Committee of 5: Must have 3 Math Lovers.: Committee of 5 Ways: (7C3)(5C2) If that were to mean Must have 3 Math Lovers 'at least' Ways: (7C3)(5C2) + (7C4)(5C1) + (7C5)(5C0) Wish You the Best in your Studies.