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1. 40 + 6 × 13 – 7 × 2 = 104 ⇒ 40 – 7 × 13 + 6 × 2 ⇒ 40 – 91 + 12 ⇒ - 39 ≠ 104 2. 35 – 7 × 3 + 6 = 45 ⇒ 35 + 6 × 3 – 7 ⇒ 35 + 18 – 7 ⇒ 46 ≠ 45 3. 6 × 14 + 36 ÷ 7 – 2 = 92 ⇒ 7 × 14 – 36 ÷ 6 + 2 ⇒ 98 – 6 + 2 ⇒ 94 ≠ 92 4. 38 – 6 × 13 + 66 ÷ 7 = 118 ⇒ 38 + 7 × 13 – 66 ÷ 6 ⇒ 38 + 91 – 11 ⇒ 118 = 118 Hence, option 4 is correct.
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