Directions: Using the digits 1 through 9, once each, fill in the blanks so that the statement is true. Can you find more than one?
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Hint
What numbers do you think would be too large? What do you think would be too small?
Answer
6C3=20, 7C2=21, 7C5=21, 8C2=28, 8C6=28
Source: Kerri Swails, Mark Alvaro