Question

Which of the following doesn't have the same factorial notation?
A---- { ( n + 1 ) n ( n - 1 ) ( n - 2 ) } / ( 321 )
B---- { ( n + 1 ) n ( n - 1 )! / { 6 * ( n - 3 )! }
C---- ( n - 1 )! / { ( 321 ) * ( n - 3 ) !}

1 C only
2 A & B only
3 A, B & C
4 A only
5 B only

Answer 1

what have you tried so far

Answer 2

you can expand the factorial like this : (n-1)! = (n-1)(n-2)(n-3)!

Answer 3

but i want the best answer hehe.. i try

Answer 4

I can help you if you try :)

Answer 5

I don't want to be just giving you best answers

Answer 6

thank you.. but i try :)