1. And then what was n minus k factorial?

그러면 ( n- k )! 은 몇이죠?

2. And that's 5 times 3 times 2 times 1, over -- 3 factorial is just 6.

그 결과는 5 x 4 x 3 x 2 x 1 나누기.... ( 역자 주:

3. When k is equal to 3, this expression is going to the absolute value of 2 over 1 factorial.

이 식은 2/ 1! 의 절댓값이 됩니다