n
p =n!/(n-r)!
r
and
n
c =n!/r!(n-r)!
r
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The Maths terms combination and permutation apply in chemistry when making the expected industrial calculation.
If there is a group of 3 coloured balls, then any groups of 2 balls selected from it will be considered as a combination, whereas the different arrangements of every combination will be considered as a permutation
They are called combination locks because that is the general, conventional term used. Trying to call them permutation locks is mixing different areas of usage together and that is not valid.
yes math is debatable.... ex. combination and permutation are very arguable
In permutations the order of the elements does matter. In combinations it does not.So, the permutations 1,2,3 and 3,1,2 are not the same. But they are the same combination.