Question : Directions: By interchanging the two signs which of the following equations will not be correct? + and × I.15 + 5 ÷ 1 – 9 × 4 = 70 II.18 × 17 + 3 – 6 ÷ 2 = 133
Option 1: Neither I nor II
Option 2: Only II
Option 3: Both I and II
Option 4: Only I
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Correct Answer: Only II
Solution : Given: + and × are interchanged. I.15 + 5 ÷ 1 – 9 × 4 = 70 II.18 × 17 + 3 – 6 ÷ 2 = 133
After interchanging the symbols the equation becomes – I.15 × 5 ÷ 1 – 9 + 4 = 70 = 75 – 5 = 70 = R.H.S. II.18 + 17 × 3 – 6 ÷ 2 = 133 = 18 + 17 × 3 – 3 = 18 + 51 – 3 = 66 ≠ 133
So, the equation II is not correct. Hence, the second option is correct.
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