Question

hello please fast

but not only say a b c d e
why its abcde write pleaseee ​

Answer 1

Step-by-step explanation:

(12!-10!)/9! it's a factorials question

(12×11×10×9×8×7×6×5×4×3×2×1)-(10×9×8×7×6×5×4×3×2×1)/9×8×7×6×5×4×3×2×1

(479001600-362880)/362880

475372800/362880

1310

question 3 answer is 1310

✓(17!-16!)/16!

✓(17!/16!)-(16!/16!)

✓(17!/16!-1

✓(17*16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1////16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1) -1

all 16 factorials are divided

✓17-1

✓16

4

I hope you like my answer

Answer 2

C) 1310

C) 4

Step-by-step explanation:

3)

$= \frac{12 !- 10!}{9!} \\ \\ = \frac{12 \times 11 \times 10! - 10!}{9!} \\ \\ = \frac{10!(12 \times 11 - 1)}{9!} \\ \\ = \frac{10 \times 9!(132 - 1)}{9!} \\ \\ = \frac{10 \times \cancel{9!}(131)}{\cancel{9!}} \\ \\ = 1310 \\ \\ \sf \therefore \: Our \: required \: answer \: is \: 1310$

4)

$= \sqrt{ \frac{17! - 16!}{16!}} \\ \\ = \sqrt{\frac{17 \times 16! - 16!}{16!}} \\ \\ = \sqrt{ \frac{\cancel{16!}(17 - 1)}{\cancel{16!}}} \\ \\ = \sqrt{16} \\ \\ = 4 \\ \\ \sf \therefore \: Our \: required \: answer \: is \: 4$

Only 1 formula Used

n! = n*(n-1)!

= n*(n-1)(n-2)(n-3)!...so on