6.2 Factorial Notation

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Solved Examples

  1. 7!5!=7×6×5!5!=42\frac{7!}{5!} = \frac{7 \times 6 \times 5!}{5!} = 42.
  2. 12!10!2!=12×11×10!10!×(2×1)=12×112=6×11=66\frac{12!}{10!2!} = \frac{12 \times 11 \times 10!}{10! \times (2 \times 1)} = \frac{12 \times 11}{2} = 6 \times 11 = 66.

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