Question: How many different samples of size n = 2 can be extracted from a population N, where: a) N = 6 b) N = 25

How many different samples of size n = 2 can be extracted from a population N, where:

a) N = 6

b) N = 25

I thought that I needed to use a combination formula, but another doc that I've found shows the procedure like:

a) (6-2)/(6-1)=0.8

b) (25-2)/(25-1)=0.9583

Are these answers right? Or I should use the combination formula? Why? Thanks btw, here's the formula that I've used first:

How many different samples of size n = 2 can be extracted

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