2010007105

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Project ID: 
2010007105
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Accepted: 
0
Clonable: 
1
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0
There are 20 girls and 10 boys in the class. How many ways are there to designate a president and vice-president of the class if it is required that at least one position will be held by a girl.
22010+2019=780
22010=400
2019=380
2010=200