Evaluate: 41 - [21 - {11 - (15 - 7 ÷ 3 × 3)}]

Correct option is B

Given:

Expression = 41 - [21 - {11 - (15 - 7 ÷ 3 × 3)}]

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:

​41 - [21 - {11 - (15 - 7 ÷ 3 × 3)}]

= 41 - [21 - {11 - (15 - $$\frac 73 \times 3$$​ )}]

=41 - [21 - {11 - (15 - 7 )}]

= 41 - [21 - {11 - 8}]

= 41 - [21 - 3]

= 41 - 18 = 23