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How many different teams of 4 can be chosen from a group of 15 children and 17 adults if each team must have at least one adult on it?

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How many different teams of 4 can be chosen from a group of 15 children and 17 adults if each team must have at least one adult on it?

 
 
 
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According to provided data, there is total of 15 children (C) and 17 adults (A). Therefore, the possible comb...

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"С, 3
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n! "С, 3 r(п-г)!

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