1.

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)

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