Question

The number of binary operations on the set $\{1,2,3\}$ is ______

• A. $3!$
• B. $9^3$
• C. $3^9$
• D. $27$

Answer 1

The correct option is C $3^9$

Number of binary operations on the set $\{1,2,3\}=n^{n^2}=3^{3^2}=3^9$