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If x = 7, y = 4, z = 9, then which of the following is TRUE?I. x + y + z = 20II. x - y + z = 13III. x + y - z = 3IV. -x + y - z = -12A. I and IIB. III and IVC. I and IVD. I and III1. A2. D3. C4. B |
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Answer» Correct Answer - Option 3 : C Given: x = 7, y = 4, z = 9 Calculation: I. x + y + z = 20 LHS, x + y + z = 7 + 4 + 9 ⇒ x + y + z = 20 LHS = RHS II. x – y + z = 13 LHS, x – y + z = 7 – 4 + 9 ⇒ x – y + z = 12 LHS ≠ RHS III. x + y – z = 3 LHS, x + y – z = 7 + 4 – 9 ⇒ x + y – z = 2 LHS ≠ RHS IV. -x + y – z = -12 LHS, -x + y – z = -7 + 4 – 9 ⇒ -x + y – z = -12 LHS = RHS ∴ I and IV are TRUE. |
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