Question

calcule os fatoriais 6!9!_12!

Answer 1

Imagine o ponto como exclamação

$\frac{6.9.}{12.} = \frac{6.9.}{12 \times 11 \times 10 \times 9.} = \frac{6.}{12 \times 11 \times 10} = \frac{6 \times 5 \times 4 \times 3 \times 2 \times 1}{12 \times 11 \times 10} = \frac{4 \times 3 \times 2 \times 1}{2 \times 11 \times 2} = \frac{4 \times 3}{2 \times 11} = \frac{12}{22} = \frac{6}{11}$