Question

12!=__________________
a) 12x1
b) 12x11x10x9!
c) 12
d) 12x11x10x9x8x7x6x5x4x3x2x1
e) 12!x11!
(can have more than one asnwer, it has been a while since I've done this)

Answer 1

b and d

Answer 2

b and d

Answer 3

b

Answer 4

you have to know that
n! = n*(n-1)*(n-2*)(n-3).....*(n-x)!
can also be written as
n! = n*(n-1)!
or
n! = n(*n-1)*(n-2)!
and so on
so 12! = 12*11!
12! = 12*11*10!
12!=12*11*10*9!
12!=12*11*10*9*8*.........*2*1
therefore the answer is b and d