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Which of the following is not true?(A) (7 + 8) + 9 = 7 + (8 + 9)(B) (7 × 8) × 9 = 7 × (8 × 9)(C) 7 + 8 × 9 = (7 + 8) × (7 + 9)(D) 7 × (8 + 9) = (7 × 8) + (7 × 9) |
Answer» (C) 7 + 8 × 9 = (7 + 8) × (7 + 9) Consider the left hand side = 7 + 8 × 9 = 7 + (8 × 9) = 7 + 72 = 79 Now, consider the right hand side = (7 + 8) × (7 + 9) = 15 × 16 = 240 By comparing LHS and RHS LHS ≠ RHS 79 ≠ 240 |
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