Question

Evaluate.
11! over 9!(11 - 9)!

Answer 1

220 is ans by many hardworking But I don't knows which

Answer 2

`\huge{\boxed{\sf 55}}`

Step-by-step explanation:

`\sf Combination \ Formula = \ _n C_r=(n !)/(r ! (n-r) !)`

Here given:

• n = 11

• r = 9

• 
  `\bf _(11) C_9`

Evaluate:

`\rightarrow \sf (11 !)/(9 ! (11-9) !)`

`\rightarrow \sf (39916800)/( 362800 (2))`

`\rightarrow \sf (39916800)/(725760)`

`\rightarrow \sf 55`