Answer:
3 / 4
Explanations:
The given fractions are 6/12 , 9/18, 3/4, and 4/8
For 6/12
![\begin{gathered} \text{Divide both the numerator and the denominator by 6} \\ (6/6)/(12/6)=(1)/(2) \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/kg78cu2a803fu87u6lrzznr0gsjhz3e2ba.png)
For 9/18
![\begin{gathered} \text{Divide both the numerator and the denominator by 9} \\ (9/9)/(18/9)=\text{ }(1)/(2) \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/ps3wxsgekzqi96sqdsfzvpd56ietd0u7bw.png)
For 3/4
3/4 is already the simplest term, It cannot be reduced further
For 4/8
![\begin{gathered} \text{Divide both the numerator and the denominator by 4} \\ (4/4)/(8/4)=\text{ }(1)/(2) \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/vsooubuxonxc4equv9g8m1s850i884jy2l.png)
6/12, 9/18 and 4/8 reduced to 1/2 except 3/4
Therefore, 3/4 does not belong to the group