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Could someone explain this to me? Thanks!

imo the mark is like a benchmark, but the price per hour for teaching would depend on your past experience and ur success stories

its often quite hard to get into work experience programs unless you have inside connections with someone who works there.

do you have more chemistry or physics trials? thanks

I was thinking that... but that would mean that they are all the same rings. It says that the rings are all different, so would you times it by 6fact?

In how many ways can you place 6 different rings on 4 fingers of a hand (excluding the thumb) if: a) Some fingers can be empty? b) None of the fingers can be empty? Can this be solved using stars and bars?