Rose Day

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Today is rose day, batch mates of Kabir and Tara decided to celebrate this day by exchanging roses with each other. $Note:$ exchanging means both the boy and the girl will give rose to each other. In the class there are $B$ boys and $G$ girls. Exchange of rose will take place if and only if at least one of them hasn't received a rose from anyone else and a rose can be exchanged only once

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