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4.How many students in a class must there be (smallest size) to ensure that at least...

4.How many students in a class must there be (smallest size) to ensure that at least 10 students get the same grade (one of A, B, C, D, F, or N)?

(Using the pigeonhole principle)

(Please explain it, finding the principle difficult to understand. Thank you!)

Math   Advanced-Math   
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