8 Lili has 20 friends. Among them are Kevin and Gerry, who are husband and wife. Lili...
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8 Lili has 20 friends. Among them are Kevin and Gerry, who are husband and wife. Lili wants to invite six of her friends to her birthday party. If neither Kevin nor Gerry will go to a party without the other, how many choices does Lili have?
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