A third-grade class is told to send a valentine to every single one of their classmates. On Valentine’s Day, the class ends up with 306 valentines. How many students are in the class?
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18.
(X-1)*X=306
X^2-18x+17x-306=0
X=18
(X-1)*X=306
X^2-18x+17x-306=0
X=18
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there will upto 18 students or 20
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