Question

Somebody please help me idk what to do ‍♂️‍♂️

Answer 1

21

Explanation:

Note that n! = n(n - 1)(n - 2) ..... × 3 × 2 × 1, thus

7! = 7 × 6 × 5 × 4 × 3 × 2 × 1

5! = 5 × 4 × 3 × 2 × 1

2! = 2 × 1

Hence

cancel 5 × 4 × 3 × 2 × 1 on numerator/ denominator, leaving

`(7(6))/(2(1))` =
`(42)/(2)` = 21