Find the value of $$[(12÷4)×\left[{\frac {15}5 +\frac {16}1×(9-8)}\right]$$​
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Correct option is A

Given:
​$$[(12÷4)×\left[{\frac {15}5 +\frac {16}1×(9-8)}\right]$$  
Concept Used: ​

​$$\begin{array}{|c|c|} \hline \textbf{Operation preference wise} & \textbf{Symbol} \\ \hline Brackets &[],{}, () \\ \hline Orders, of & ² (power), √ (root) , of \\ \hline Division & ÷ \\ \hline Multiplication & × \\ \hline Addition & + \\ \hline Subtraction & - \\ \hline \end{array}$$

Solution:

​$$[(12÷4)×\left[{\frac {15}5 +\frac {16}1×(9-8)}\right] \\= [3×\left[{3 + 16×1 }\right]]\\= [3× 19]\\= 57\\$$​​