There are 9 interactive basic building blocks of an organization. How many two-blocks combinations are there?

Correct result:

n =  36


C2(9)=(92)=9!2!(92)!=9821=36  n=(92)=36C_{{ 2}}(9)=\dbinom{ 9}{ 2}=\dfrac{ 9! }{ 2!(9-2)!}=\dfrac{ 9 \cdot 8 } { 2 \cdot 1 }=36 \ \\ \ \\ n={ { 9 } \choose 2 }=36

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