6C2

a.15

b.720

c.1

d.30

Are the 6 and the two subscript?

yes

So if so, this is a combination. It means "six combination 2" it can be written like this instead:

(6

2)

Imagine those as big parentheses. We will get 15. Do you need a step by step?

Here is a great little website for future reference or confusion. https://www.mathsisfun.com/combinatorics/combinations-permutations.html

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