But the formula you are giving is not the formula of combination it is the formula of permutation.
sorry but I can't understand where my reasoning is wrong:
I'm studying on the mgmat book
and they say "when you choose x person in a group of y, then the formula is Y!/X!"(the order is important):
123XXXX= 7!/4!= 210 ways
if I want to choose 5 numbers in a group of ten, in which the order is important, is wrong 10!/5!?
if I'm wrong, could you write the right formula if I want to calculate the result in "my " way?