Combinations and Permutations

Directions: Using the digits 1 through 9, once each, fill in the blanks so that the statement is true.


Write down the formulas for nCr and nPr and try a few guesses!


6C3 = 5P2, 6C1 = 3P2, 6C5 = 3P2

Source: Mark Alvaro and Kerri Swails

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Mean of Frequency Table

Directions: Using the digits 1 to 9 at most one time each, place a digit …


  1. At most once each?

  2. 4C2 = 6P1

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