Question

How can i do like 16!/4!12! ???
and can teach the rule ?

Answer 1

This is a combination. 16c12 to be exact.

Answer 2

\(\Large \color{Black}{\Rightarrow 16c12 = {16! \over (16 - 12)! \times 12!} }\)

Answer 3

then it will 1/12!x12! ????

Answer 4

Umm no

Answer 5

\(\Large \color{Black}{\Rightarrow {16 \times 15 \times 14 \times 13 \over4!} }\)

Answer 6

I have cancelled 12! out of the scenario

Answer 7

\(\Large \color{Black}{\Rightarrow {16 \times 15 \times 14 \times 13 \over 4 \times 3 \times 2} }\)

Answer 8

question if 4! then 4x3x2????

Answer 9

and if 16! 16x15x14x13x12x11x10....x2 like this???

Answer 10

yes. n! = n*(n-1)*(n-2)*...*1
so 4!= 4*3*2*1

to evaluate your 16!/(4! 12!) expand and then divide out