Question : Directions: By interchanging the given two signs which of the following equations will NOT be correct? × and – I. 4 ÷ 2 + 1 × 6 – 3 = 13 II. 5 + 7 – 8 × 2 ÷ 1 = 58
Option 1: Only II
Option 2: Only I
Option 3: Neither I nor II
Option 4: Both I and II
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Correct Answer: Both I and II
Solution : Given: Interchange the signs × and –.
I. 4 ÷ 2 + 1 × 6 – 3 = 13 After interchanging the signs the equation becomes – 4 ÷ 2 + 1 – 6 × 3 = 13 L.H.S.→ 2 + 1 – 18 = – 15 ≠ 13 II. 5 + 7 – 8 × 2 ÷ 1 = 58 After interchanging the signs the equation becomes – 5 + 7 × 8 – 2 ÷ 1 = 58 L.H.S.→5 + 7 × 8 – 2 5 + 56 – 2 = 59 ≠ 58
So, both the equations are incorrect. Hence, the fourth option is correct.
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