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Solutions
Given equation: 39 ÷ 3 – 11+ 57 × 29 = 171.
BODMAS Table:

Let's check each option one by one.
Option 1) – and ×
Given: 39 ÷ 3 – 11 + 57 × 29 = 171
After interchanging the sign we get;
⇒ 39 ÷ 3 × 11 + 57 – 29 = 171
⇒ 143 + 57 - 29 = 171
⇒ 200 - 29 = 171
⇒ 171 = 171
⇒ LHS = RHS
Option 2) – and +
Given: 39 ÷ 3 – 11 + 57 × 29 = 171
After interchanging the numbers we get;
⇒ 39 ÷ 3 + 11 - 57 × 29 = 171
⇒ 13 + 11 - 57 × 29 = 171
⇒ 13 + 11 - 1653 = 171
⇒ 24 - 1653 = 171
⇒ -1629 ≠ 171
⇒ LHS ≠ RHS
Option 3) ÷ and +
Given: 39 ÷ 3 – 11 + 57 × 29 = 171
After interchanging the numbers we get;
⇒ 39 + 3 – 11 ÷ 57 × 29 = 171
⇒ 39 + 3 – 5.596 = 171
⇒ 42 – 5.596 = 171
⇒ 47.596 ≠ 171
⇒ LHS ≠ RHS
Option 4) ÷ and -
Given: 39 ÷ 3 – 11 + 57 × 29 = 171
After interchanging the numbers we get;
⇒ 39 - 3 ÷ 11 + 57 × 29 = 171
⇒ 39 - 0.272 + 57 × 29 = 171
⇒ 39 - 0.272 + 1653 = 171
⇒ 1691.728 ≠ 171
⇒ LHS ≠ RHS
Hence, the correct answer is "Option 1".