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What will come in the place of the question mark '(?)' in the following equation, if '×' and '÷' are interchanged and '-' and '+' are interchanged?72
Question

What will come in the place of the question mark '(?)' in the following equation, if '×' and '÷' are interchanged and '-' and '+' are interchanged?
72 + 5 - 42 × 7 ÷ 1 = ?

A.

71

B.

70

C.

73

D.

72

Correct option is C

Given: 72 + 5 - 42 × 7 ÷ 1 = ?
Sign
×
-
Interchange sign
÷
+
Operation preference wiseSymbolBrackets[],,()Orders, of(power),(root),ofDivision÷Multiplication×Addition+Subtraction\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[],{}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\ \hline \text{Addition} & + \\ \hline \text{Subtraction} & - \\\hline\end{array}​​
After interchanging the sign in the given equation will be
72 - 5 + 42 ÷ 7 × 1 = ?
? = 72 - 5 + 6 × 1
? = 72 - 5 + 6 
? = 72 + 6 - 5 
? = 78 - 5 
? = 73
Thus, the correct option is (c) 73.

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