Combinations and Permutations

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

Hint

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

Answer

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

Source: Mark Alvaro and Kerri Swails

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3 comments

  1. At most once each?

  2. 4C2 = 6P1

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