Question

9 Combination 2

Answer 1

@Nnesha

Answer 2

same formula

Answer 3

\[\frac{ 9! }{ 2! (9-2)! }\]

Answer 4

looks good

Answer 5

\[\frac{ 9*8*7*6*5*4*3*2*1 }{ 2*1 (7)! }\]

Answer 6

that's right
but here is a shortcut \[\huge\rm \frac{ 9 · 8 · 7! }{ 2!(7)! } =\]
there is 7! at the misdemeanor
so you can expand 9! to 7! so you cancel them out
then we don't need a calculator

Answer 7

but then wouldnt it just be 9*8

Answer 8

\[\huge\rm \frac{ 9 · 8 ·\cancel{7!} }{ 2!\cancel{(7)!} } =\]

Answer 9

yes right

Answer 10

but don't forget the 2! at the denominator

Answer 11

then 2 goes into 8 2 times and 8/2=4 so 9*4=36?

Answer 12

right

Answer 13

k thx

Answer 14

np :=)