​$$\textbf{Simplify} \quad 18 \times \left( 12 \times (1^2) \right) \div 3 + 20 - 84$$​​

Correct option is A

Given:

​$$18 \times \left( 12 \times (1^2) \right) \div 3 + 20 - 84$$

Concept Used:

​$$\begin{array}{|l|l|}\hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} & [\,], \{\,\}, (\,) \\\hline\text{Orders, of} & ^x \, (\text{power}), \, \sqrt{} \, (\text{root}), \, \text{of} \\\hline\text{Division} & \div \\\hline\text{Multiplication} & \times \\\hline\text{Addition} & + \\\hline\text{Subtraction} & - \\\hline\end{array}$$

Solution:

$$18 \times \left( 12 \times (1^2) \right) \div 3 + 20 - 84 \\ \ \\=18 \times 12\div 3 + 20 - 84 \\ \ \\=18 \times 4 + 20 - 84\\ \ \\=72+ 20 - 84 = 92-84 = 8$$​​