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Option 1 : equation A
Equation: A 90 ÷ 6 + 4 – 20 × 12 = 52
By interchanging → 90 ÷ 6 × 4 – 20 + 12 = 15 × 4 – 20 +12 = 60 – 8 = 52
Equation: B 24 + 4 × 10 – 4 ÷ 4 = 36
By interchanging → 24 × 4 + 10 – 4 ÷ 4 = 96 + 6 – 1 = 101 ≠ 36
Equation: C 34 × 12 ÷ 6 + 10 – 6 = 28
By interchanging → 34 + 12 ÷ 6 X 10 – 6 = 34 + 2 X 10 – 6 = 34 +20 – 6 = 48 ≠ 28
Equation: D 42 ÷ 14 + 6 × 4 – 12 = 30
By interchanging → 42 ÷ 14 X 6 + 4 – 12 = 3 X 6 + 4 - 12 = 18 + 4 - 12 = 10 ≠ 30
Hence, equation 1 will be correct after interchanging + and ×.
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